php header()函数详细实用方法

更新时间：2016年11月25日 15:09 点击：1312

header(string,replace,http_response_code)
string 必需。规定要发送的报头字符串。
replace 可选。指示该报头是否替换之前的报头，或添加第二个报头。

默认是 true（替换）。false（允许相同类型的多个报头）。

http_response_code 可选。把 http 响应代码强制为指定的值。（php 4 以及更高版本可用）

跳转

header('location: http://www.111cn.net/');

发送http状态

header("status: 404 not found");

设置缓存

header("cache-control: no-cache, must-revalidate"); // http/1.1
header("expires: sat, 26 jul 1997 05:00:00 gmt");

利用header做文件下载功能

header("content-type:application/pdf");

// 文件将被称为 downloaded.pdf

header("content-disposition:attachment;filename='downloaded.pdf'");

// pdf 源在 original.pdf 中
readfile("original.pdf");

list() 函数用数组中的元素为一组变量赋值。

注意，与 array() 类似，list() 实际上是一种语言结构，不是函数。

each

each() 函数生成一个由数组当前内部指针所指向的元素的键名和键值组成的数组，并把内部指针向前移动。

返回的数组中包括的四个元素：键名为 0，1，key 和 value。单元 0 和 key 包含有数组单元的键名，1 和 value 包含有数据。

如果内部指针越过了数组范围，本函数将返回 false。

$sports = array(
    'football' => 'good',
    'swimming' => 'very well',
    'running' => 'not good'
);

while (list($key, $value) = each($sports)) {
    echo $key.": ".$value."<br />";
}

/*
foreach
php教程中的foreach是用来进行循环对一个数组的所有元素。作者的foreach基本语法如下：

foreach ($array_variable as $value)
{
[code to execute]
}

or

foreach ($array_variable as $key => $value)
{
[code to execute]
}

$sports = array(
    'football' => 'good',
    'swimming' => 'very well',
    'running' => 'not good'
);

foreach ($sports as $key => $value) {
    echo $key.": ".$value."<br />";
}

虽然php提供了大量的数组排序函数，但是都不太可以满足我们平常使用中的需要，下面我先介绍一下php中种排序函数，然后再综合一个实例来说数组值，键名等进行排序。

//sort() 函数按升序对给定数组的值排序。

$my_array = array("a" => "dog", "b" => "cat", "c" => "horse");

sort($my_array);
print_r($my_array);

//krsort(array,sorttype)函数将数组按照键逆向排序，为数组值保留原来的键。
$my_array = array("a" => "dog", "b" => "cat", "c" => "horse");
krsort($my_array);
print_r($my_array);

//看一款实例

function natkrsort($array)
{
    $keys = array_keys($array);
    natsort($keys);

    foreach ($keys as $k)
    {
        $new_array[$k] = $array[$k];
    }

    $new_array = array_reverse($new_array, true);

    return $new_array;
}

// arsort() arsort() 函数对数组进行逆向排序并保持索引关系。主要用于对那些单元顺序很重要的结合数组进行排序。

$my_array = array("a" => "dog", "b" => "cat", "c" => "horse");

arsort($my_array);
print_r($my_array);

//asort() 函数对数组进行排序并保持索引关系。主要用于对那些单元顺序很重要的结合数组进行排序

$my_array = array("a" => "dog", "b" => "cat", "c" => "horse");

asort($my_array);
print_r($my_array);

//缩合上面的实例，写一款数组排序函数

/**

* 对数组排序
* @param array $array 操作的数组
* @param string $type key按键排序，value按值排序
* @param string $field 字段名
* @param string $order 排序方式asc顺序desc逆序
* @return void
*/
function sort(&$array, $type = 'value', $field = null, $order = 'asc') {
  if ($field) {
   foreach ($array as $key => $value) {
    $temp[$key] = $value[$field];
   }
   if ($order=='asc') {
    asort($temp);
   } else {
    arsort($temp);
   }
   $newarray = array();
   foreach ($temp as $key => $value) {
    $newarray[] = $array[$key];
   }
   $array = $newarray;
  } else {
   if ($type=='key') {
    if ($order=='asc') {
     ksort($array);
    } else {
     krsort($array);
    }
   } else {
    if ($order=='asc') {
     asort($array);
    } else {
     arsort($array);
    }
   }
  }
}

可变变量名指的是使用一个变量的值作为这个变量的名称。在上面的例子中，通过使用两个$符号，你可以把hello设置成一个变量的名称

例

<?php $a = 'hello'; ?>

，就像下面那样。

<?php $$a = 'world'; ?>

通过上面的两个语句，有两个变量被定义：变量$a，装的内容是”hello” 以及变量$hello，装的内容是 “world”。于是，下面的语言：

<?php echo "$a ${$a}"; ?>

跟下面的语句的输出完全一致：

<?php echo "$a $hello"; ?>

它们都输出：hello world。

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html>
<head>

<title>sample 1</title>

<style>

body { padding: 10px 0px 0px 0px; }

td
{
padding: 2px 5px;
text-align: left;
}

h4 { margin: 0px; }

input.editfield, select.editfield, textarea.editfield { width: 18em; }

</style>

</head>
<body>
<center>

<input type="hidden" name="form_validation_rules" value="
username password year month day details : empty;
username password : len >= 3;
username password : chnum_;
e-mail: email;
membership : select 0;
year : > 1900;
year month day : date;
sex : radio;
details: len <= 20;
categories[] newsletters[] : cnt >= 2;
agree : terms;
" />

<table>

<tr>
<td style="padding-bottom: 10px;" colspan="2"><h4>sample 1</h4></td>
</tr>

<tr>
<td>username:</td>
<td><input class="editfield" type="text" name="username" /></td>
</tr>

<tr>
<td>password:</td>
<td><input class="editfield" type="password" name="password" /></td>
</tr>

<tr>
<td>membership:</td>
<td>
<select class="editfield" name="membership">
    <option value="0"></option>
    <option value="1">silver</option>
    <option value="2">gold</option>
    <option value="3">platinum</option>
</select>
</td>
</tr>

<tr>
<td>sex:</td>
<td>
<input type="radio" name="sex" value="male" /> male
<input type="radio" name="sex" value="female" /> female
</td>
</tr>

<tr>
<td>details:</td>
<td>
<textarea class="editfield" name="details" rows="4"></textarea>
<br />
<small><span id="details_count">0</span> out of 20 characters</small>
</td>
</tr>

<tr>
<td>categories:</td>
<td>
<select class="editfield" name="categories[]" multiple="multiple" size="4">
    <option value="0">cars</option>
    <option value="1">computers</option>
    <option value="2">dogs</option>
    <option value="3">food</option>
</select>
<br />
<small>use ctrl+mouse to select multiple categories</small>
</td>
</tr>

<tr>
<td>newsletters:</td>
<td>
<input type="checkbox" name="newsletters[]" value="0" /> cars <br />
<input type="checkbox" name="newsletters[]" value="1" /> computers <br />
<input type="checkbox" name="newsletters[]" value="2" /> dogs <br />
<input type="checkbox" name="newsletters[]" value="3" /> food
</td>
</tr>

<tr>
<td></td>
<td>
<input type="checkbox" name="agree" />
<small>by checking this box you agree to some terms</small>
</td>
</tr>

</table>

</form>

// ***** data arrays ***********************************************************

// ***** options *****

var form_validation_options =
{
"override_enter" : true,
"override_bksp" : true
};

// ***** messages *****

var form_validation_alerts =
{
    '>'      : "%%name%% should be more than %%num%%!",
    '<'      : "%%name%% should be less than %%num%%!",
    '>='     : "%%name%% should be more or equal to %%num%%!",
    '<='     : "%%name%% should be less or equal to %%num%%!",
    'ch'     : "%%name%% contains invalid characters!",
    'chnum_' : "%%name%% contains invalid characters!",
    'cnt >' : "you should select more than %%num%% %%name%%!",
    'cnt <' : "you should select less than %%num%% %%name%%!",
    'cnt >=' : "you should select at least %%num%% %%name%%!",
    'cnt <=' : "you should select at most %%num%% %%name%%!",
    'cnt ==' : "you should select %%num%% %%name%%!",
    'date'   : "please, enter a valid %%name%%!",
    'email' : "please, enter a valid e-mail address!",
    'empty' : "please, enter %%name%%!",
    'len >' : "%%name%% should contain more than %%num%% characters!",
    'len <' : "%%name%% should contain less than %%num%% characters!",
    'len >=' : "%%name%% should contain at least %%num%% characters!",
    'len <=' : "%%name%% should contain at most %%num%% characters!",
    'len ==' : "%%name%% should contain %%num%% characters!",
    'num'    : "%%name%% is not a valid number!",
    'radio' : "please, select %%name%%!",
    'select' : "please, select %%name%%!",
    'terms' : "you must agree to the terms first!"
};

// ***** form field types *****

var form_validation_nonedit = ' button hidden reset submit ';
var form_validation_edit    = ' checkbox file password radio select-multiple select-one text textarea ';
var form_validation_type    = ' file password text textarea ';
var form_validation_check   = ' checkbox radiox select-multiple select-one ';

// ***** alert *****************************************************************

function form_validation_alert(type, name, num)
{
name = name.replace(/^w*(w*)w*$/, "$1");

msg = form_validation_alerts[type];
msg = msg.replace('%%name%%', name.substr(0, 1).touppercase()+name.substr(1, name.length-1).tolowercase());
msg = msg.replace('%%name%%', name.tolowercase());
msg = msg.replace('%%num%%', num);

alert(msg);

return false;
}

// ***** behave ****************************************************************

function form_validation_behave(control, key, rules)
{
rules = form_validation_rules2array(rules);

for (var i = 0; i < rules.length; i++)
{
var rule = rules[i].split(/s*:s*/);

if (rule.length < 2) continue;
if (!form_validation_instring(' '+rule[0]+' ', control.name)) continue;

rule[1] = rule[1].split(/s+/);

    switch (rule[1][0])
    {
      // ***** count *****

      case 'count':
        document.getelementbyid(rule[1][1]).innerhtml = control.value.length;
        if (rule[1].length >= 5)
          if (control.value.length < rule[1][2])
               document.getelementbyid(rule[1][1]).style.color = rule[1][3];
          else document.getelementbyid(rule[1][1]).style.color = rule[1][4];
        break;

// ***** next *****

      case 'next':
        if (control.value.length == rule[1][1]) form_validation_focusnext(control);
        break;

// ***** prev *****

      case 'prev':
        if (control.value.length == 0 && key == 8) form_validation_focusprev(control);
        break;
    }
}

return true;
}

// ***** getelement ************************************************************

function form_validation_getelement(tag, name)
{
for (var i = 0; i < tag.elements.length; i++)
if (tag.elements[i].name == name) return tag.elements[i];
return undefined;
}

// ***** instring **************************************************************

function form_validation_instring(str, val)
{
return str.indexof(' '+val+' ') >= 0;
}

// ***** focusnext *************************************************************

function form_validation_focusnext(tag)
{
for (var i = 0; i < tag.form.elements.length; i++)
    if (tag.form.elements[i] == tag)
      for (var j = i+1; j < tag.form.elements.length; j++)
        if (form_validation_instring(form_validation_edit, tag.form.elements[j].type))
        {
          if (form_validation_instring(form_validation_type, tag.form.elements[j].type))
               form_validation_setselection(tag.form.elements[j], 0, 0, 'frend');
          else tag.form.elements[j].focus();
          return false;
        }

return true;
}

// ***** focusprev *************************************************************

function form_validation_focusprev(tag)
{
for (var i = 0; i < tag.form.elements.length; i++)
    if (tag.form.elements[i] == tag)
      for (var j = i-1; j >= 0; j--)
        if (form_validation_instring(form_validation_edit, tag.form.elements[j].type))
        {
          if (form_validation_instring(form_validation_type, tag.form.elements[j].type))
               form_validation_setselection(tag.form.elements[j], 0, 0, 'frend');
          else tag.form.elements[j].focus();
          return false;
        }

return true;
}

// ***** initialize ************************************************************

function form_validation_initialize(control, rules)
{
rules = form_validation_rules2array(rules);

for (var i = 0; i < rules.length; i++)
{
var rule = rules[i].split(/s*:s*/);

if (rule.length < 2) continue;
if (!form_validation_instring(' '+rule[0]+' ', control.name)) continue;

rule[1] = rule[1].split(/s+/);

    switch (rule[1][0])
    {
      // ***** count *****

return true;
}

// ***** onchange **************************************************************

function form_validation_onchange(e)
{
var ie = navigator.appname == "microsoft internet explorer";
var tag = ie ? window.event.srcelement : e.target;

return true;
}

// ***** onkeypress ************************************************************

function form_validation_onkeypress(e)
{
var ie = navigator.appname == "microsoft internet explorer";
var tag = ie ? window.event.srcelement : e.target;
var key = ie ? window.event.keycode : e.which;

if (form_validation_options['override_backspace'])
if (key == 8)
return form_validation_instring(form_validation_type, tag.type);

if (form_validation_options['override_enter'])
if (key == 13 && tag.type != 'textarea')
return form_validation_focusnext(tag);

return true;
}

// ***** onkeyup ***************************************************************

function form_validation_onkeyup(e)
{
var ie = navigator.appname == "microsoft internet explorer";
var tag = ie ? window.event.srcelement : e.target;
var key = ie ? window.event.keycode : e.which;

var behaviours = form_validation_getelement(tag.form, 'form_validation_behaviours');

if (behaviours !== undefined) form_validation_behave(tag, key, behaviours.value);
}

// ***** onsubmit **************************************************************

function form_validation_onsubmit(e)
{
var ie = navigator.appname == "microsoft internet explorer";
var tag = ie ? window.event.srcelement : e.target;
if (tag.tagname != 'form') tag = tag.form;

// ***** validate fields *****

var rules = form_validation_getelement(tag, 'form_validation_rules');

if (rules !== undefined)
    for (var i = 0; i < tag.elements.length; i++)
      if (!form_validation_validate(tag.elements[i], rules.value))
      {
        tag.elements[i].focus();
        if (tag.elements[i].select !== undefined) tag.elements[i].select();
        return false;
      }

// ***** unset fields *****

for (var i = 0; i < tag.elements.length; i++)
{
if (tag.elements[i].name == 'form_validation_rules') tag.elements[i].value = '';
if (tag.elements[i].name == 'form_validation_behaviours') tag.elements[i].value = '';
}

return true;
}

// ***** register **************************************************************

function form_validation_register()
{
for (var i = 0; i < document.forms.length; i++)
    with (document.forms[i])
    {
      var rules      = form_validation_getelement(document.forms[i], 'form_validation_rules');
      var behaviours = form_validation_getelement(document.forms[i], 'form_validation_behaviours');

if (rules === undefined && behaviours === undefined) continue;

onsubmit = form_validation_onsubmit;

      for (var j = 0; j < elements.length; j++)
      {
        if (behaviours !== undefined) form_validation_initialize(elements[j], behaviours.value);

        elements[j].onchange   = form_validation_onchange;
        elements[j].onkeypress = form_validation_onkeypress;
        elements[j].onkeyup    = form_validation_onkeyup;
      }
    }
}

// ***** rules2array ***********************************************************

function form_validation_rules2array(rules)
{
rules = rules.replace(/^(s*)(s.*)/, "$2");
rules = rules.replace(/(.*s)(s*)$/, "$1");
return rules.split(/s*;s*/);
}

// ***** setselection **********************************************************

function form_validation_setselection(control, start, end, mode)
{
if (control.focus) control.focus();

// ***** netscape *****

if (control.selectionstart !== undefined &&
      control.selectionend   !== undefined)
{
    offset = control.selectionstart;
    if (mode == 'frstart') offset = 0;
    if (mode ==   'frend') offset = control.textlength;

control.selectionstart = offset+start;
control.selectionend = offset+end;

return true;
}

// ***** ie *****

if (control.select                 !== undefined &&
      document.selection             !== undefined &&
      document.selection.createrange !== undefined)
{
    if (mode == 'frstart' || mode == 'frend') control.select();

range = document.selection.createrange();

if (mode == 'frstart') range.moveend ("character", -range.text.length);
if (mode == 'frend') range.movestart("character", range.text.length);

    range.movestart("character", start);
    range.moveend ("character", end);
    range.select();

return true;
}

return false;
}

// ***** validate **************************************************************

function form_validation_validate(control, rules)
{
rules = form_validation_rules2array(rules);

for (var i = 0; i < rules.length; i++)
{
var rule = rules[i].split(/s*:s*/);

if (rule.length < 2) continue;
if (!form_validation_instring(' '+rule[0]+' ', control.name)) continue;

rule[1] = rule[1].split(/s+/);

    switch (rule[1][0])
    {
      // ***** comparison *****

      case '>':
        if (control.value == '' || isnan(control.value))
          return form_validation_alert('num', control.name, 0);
        if (control.value <= rule[1][1])
          return form_validation_alert('>', control.name, rule[1][1]);
        break;

      case '<':
        if (control.value == '' || isnan(control.value))
          return form_validation_alert('num', control.name, 0);
        if (control.value >= rule[1][1])
          return form_validation_alert('<', control.name, rule[1][1]);
        break;

      case '>=':
        if (control.value == '' || isnan(control.value))
          return form_validation_alert('num', control.name, 0);
        if (control.value < rule[1][1])
          return form_validation_alert('>=', control.name, rule[1][1]);
        break;

      case '<=':
        if (control.value == '' || isnan(control.value))
          return form_validation_alert('num', control.name, 0);
        if (control.value > rule[1][1])
          return form_validation_alert('<=', control.name, rule[1][1]);
        break;

// ***** ch *****

      case 'ch':
        if (!/^([a-za-z]+)$/.test(control.value))
          return form_validation_alert('ch', control.name, 0);
        break;

// ***** chnum_ *****

      case 'chnum_':
        if (!/^(w+)$/.test(control.value))
          return form_validation_alert('chnum_', control.name, 0);
        break;

// ***** cnt *****

case 'cnt':
var cnt = 0;

        if (control.type == 'select-multiple')
          for (var k = 0; k < control.options.length; k++)
            if (control.options[k].selected) cnt++;

        if (control.type == 'checkbox')
          with (control.form)
            for (var k = 0; k < elements.length; k++)
              if (elements[k].name == control.name && elements[k].checked) cnt++;

        if (rule[1][1] == '>' && cnt <= rule[1][2])
          return form_validation_alert('cnt >', control.name, rule[1][2]);
        if (rule[1][1] == '<' && cnt >= rule[1][2])
          return form_validation_alert('cnt <', control.name, rule[1][2]);
        if (rule[1][1] == '>=' && cnt < rule[1][2])
          return form_validation_alert('cnt >=', control.name, rule[1][2]);
        if (rule[1][1] == '<=' && cnt > rule[1][2])
          return form_validation_alert('cnt >=', control.name, rule[1][2]);
        if (rule[1][1] == '==' && cnt != rule[1][2])
          return form_validation_alert('cnt ==', control.name, rule[1][2]);

break;

// ***** date *****

case 'date':
rule[0] = rule[0].split(/s+/);

        if (rule[0].length == 3)
        {
          var year;
          var month;
          var day;

          with (control.form)
            for (var k = 0; k < elements.length; k++)
            {
              if (elements[k].name == rule[0][0]) year = elements[k];
              if (elements[k].name == rule[0][1]) month = elements[k];
              if (elements[k].name == rule[0][2]) day   = elements[k];
            }

          if (year !== undefined && month !== undefined && day !== undefined)
          {
            if (control == year)
              if (year.value == '' || isnan(year.value))
                return form_validation_alert('date', year.name, 0);
            if (control == month)
              if (month.value == '' || isnan(month.value) || month.value < 0 || month.value > 12)
                return form_validation_alert('date', month.name, 0);
            if (control == day)
            {
              if (day.value   == '' || isnan(day.value)   || day.value   < 0 || day.value   > 31)
                return form_validation_alert('date', day.name, 0);
              date = new date(year.value, month.value, day.value);
              if (date.getdate() != day.value)
                return form_validation_alert('date', day.name, 0);
            }
          }
        }

break;

// ***** email *****

      case 'email':
        if (!/^(w+.)*(w+)@(w+.)+(w+)$/.test(control.value))
          return form_validation_alert('email', control.name, 0);
        break;

// ***** empty *****

      case 'empty':
        if (form_validation_instring(form_validation_type, control.type) && control.value == '')
          return form_validation_alert('empty', control.name, 0);
        break;

// ***** len *****

      case 'len':
        if (rule[1][1] == '>' && control.value.length <= rule[1][2])
          return form_validation_alert('len >', control.name, rule[1][2]);
        if (rule[1][1] == '<' && control.value.length >= rule[1][2])
          return form_validation_alert('len <', control.name, rule[1][2]);
        if (rule[1][1] == '>=' && control.value.length < rule[1][2])
          return form_validation_alert('len >=', control.name, rule[1][2]);
        if (rule[1][1] == '<=' && control.value.length > rule[1][2])
          return form_validation_alert('len <=', control.name, rule[1][2]);
        if (rule[1][1] == '==' && control.value.length != rule[1][2])
          return form_validation_alert('len ==', control.name, rule[1][2]);
        break;

// ***** num *****

      case 'num':
        if (control.value == '' || isnan(control.value))
          return form_validation_alert('num', control.name, 0);
        break;

// ***** radio *****

      case 'radio':
        var checked = false;
        with (control.form)
          for (var k = 0; k < elements.length; k++)
            if (elements[k].name == control.name && elements[k].checked)
              checked = true;
        if (!checked) return form_validation_alert('radio', control.name, 0);

// ***** select *****

      case 'select':
        if (control.value == rule[1][1])
          return form_validation_alert('select', control.name, 0);
        break;

// ***** terms *****

      case 'terms':
        if (!control.checked)
          return form_validation_alert('terms', control.name, 0);
        break;
    }
}

return true;
}

// ***** initialize forms ******************************************************

form_validation_register();
</script>

</center>
</body>
</html>

把下面代码保存成php文件
$form_validation_alerts = array(
    '>'      => "%%name%% should be more than %%num%%!",
    '<'      => "%%name%% should be less than %%num%%!",
    '>='     => "%%name%% should be more or equal to %%num%%!",
    '<='     => "%%name%% should be less or equal to %%num%%!",
    'ch'     => "%%name%% contains invalid characters!",
    'chnum_' => "%%name%% contains invalid characters!",
    'cnt >' => "you should select more than %%num%% %%name%%!",
    'cnt <' => "you should select less than %%num%% %%name%%!",
    'cnt >=' => "you should select at least %%num%% %%name%%!",
    'cnt <=' => "you should select at most %%num%% %%name%%!",
    'cnt ==' => "you should select %%num%% %%name%%!",
    'date'   => "please, enter a valid %%name%%!",
    'email' => "please, enter a valid e-mail address!",
    'empty' => "please, enter %%name%%!",
    'len >' => "%%name%% should contain more than %%num%% characters!",
    'len <' => "%%name%% should contain less than %%num%% characters!",
    'len >=' => "%%name%% should contain at least %%num%% characters!",
    'len <=' => "%%name%% should contain at most %%num%% characters!",
    'len ==' => "%%name%% should contain %%num%% characters!",
    'num'    => "%%name%% is not a valid number!",
    'radio' => "please, select %%name%%!",
    'select' => "please, select %%name%%!",
    'terms' => "you must agree to the terms first!");

function form_validation_alert($type, $name, $num)
{
$name = preg_replace('/^w*(w*)w*$/', "$1", $name);

$msg = $globals['form_validation_alerts'][$type];
$msg = str_replace('%%name%%', strtoupper(substr($name, 0, 1)) . strtolower(substr($name, 1, strlen($name)-1)), $msg);
$msg = str_replace('%%name%%', strtolower($name), $msg);
$msg = str_replace('%%num%%', $num, $msg);

return $msg;
}

// ***** isnan *****************************************************************

function form_validation_isnan($value)
{
return (string)(integer)$value !== (string)$value;
}

// ***** validate **************************************************************

function form_validation_validate($data, $rules)
{
$rules = preg_replace('/^(s*)(s.*)/', "$2", $rules);
$rules = preg_split('/s*;s*/', $rules);

foreach ($rules as $i => $rule)
{
$rule = preg_split('/s*:s*/', $rule);

if (count($rule) < 2) continue;

$rule[0] = preg_split('/s+/', $rule[0]);
$rule[1] = preg_split('/s+/', $rule[1]);

    foreach ($rule[0] as $j => $name)
    {
      $name = str_replace("[]", "", $name);

if (!in_array($rule[1][0], array('cnt', 'radio', 'terms')))
if (!isset($data[$name])) return 'invalid form!';

if (!in_array($rule[1][0], array('cnt')))
if ( isset($data[$name]) && is_array($data[$name])) return 'invalid form!';

      switch ($rule[1][0])
      {
        // ***** comparison *****

        case '>':
          if (form_validation_isnan($data[$name]))
            return form_validation_alert('num', $name, 0);
          if ($data[$name] <= $rule[1][1])
            return form_validation_alert('>', $name, $rule[1][1]);
          break;

        case '<':
          if (form_validation_isnan($data[$name]))
            return form_validation_alert('num', $name, 0);
          if ($data[$name] >= $rule[1][1])
            return form_validation_alert('<', $name, $rule[1][1]);
          break;

        case '>=':
          if (form_validation_isnan($data[$name]))
            return form_validation_alert('num', $name, 0);
          if ($data[$name] < $rule[1][1])
            return form_validation_alert('>=', $name, $rule[1][1]);
          break;

        case '<=':
          if (form_validation_isnan($data[$name]))
            return form_validation_alert('num', $name, 0);
          if ($data[$name] > $rule[1][1])
            return form_validation_alert('<=', $name, $rule[1][1]);
          break;

// ***** ch *****

        case 'ch':
          if (!preg_match('/^([a-za-z]+)$/', $data[$name]))
            return form_validation_alert('ch', $name, 0);
          break;

// ***** chnum_ *****

        case 'chnum_':
          if (!preg_match('/^(w+)$/', $data[$name]))
            return form_validation_alert('chnum_', $name, 0);
          break;

// ***** cnt *****

        case 'cnt':
          $cnt = isset($data[$name]) ? (is_array($data[$name]) ? count($data[$name]) : 1) : 0;
          if ($rule[1][1] == '>' && $cnt <= $rule[1][2])
            return form_validation_alert('cnt >', $name, $rule[1][2]);
          if ($rule[1][1] == '<' && $cnt >= $rule[1][2])
            return form_validation_alert('cnt <', $name, $rule[1][2]);
          if ($rule[1][1] == '>=' && $cnt < $rule[1][2])
            return form_validation_alert('cnt >=', $name, $rule[1][2]);
          if ($rule[1][1] == '<=' && $cnt > $rule[1][2])
            return form_validation_alert('cnt <=', $name, $rule[1][2]);
          break;

// ***** email *****

        case 'email':
          if (!preg_match('/^(w+.)*(w+)@(w+.)+(w+)$/', $data[$name]))
            return form_validation_alert('email', $name, 0);
          break;

// ***** empty *****

        case 'empty':
          if ($data[$name] == '')
            return form_validation_alert('empty', $name, 0);
          break;

// ***** len *****

        case 'len':
          if ($rule[1][1] == '>' && strlen($data[$name]) <= $rule[1][2])
            return form_validation_alert('len >', $name, $rule[1][2]);
          if ($rule[1][1] == '<' && strlen($data[$name]) >= $rule[1][2])
            return form_validation_alert('len <', $name, $rule[1][2]);
          if ($rule[1][1] == '>=' && strlen($data[$name]) < $rule[1][2])
            return form_validation_alert('len >=', $name, $rule[1][2]);
          if ($rule[1][1] == '<=' && strlen($data[$name]) > $rule[1][2])
            return form_validation_alert('len <=', $name, $rule[1][2]);
          break;

// ***** num *****

        case 'num':
          if (form_validation_isnan($data[$name]))
            return form_validation_alert('num', $name, 0);
          break;

// ***** radio *****

        case 'radio':
          if (!isset($data[$name]))
            return form_validation_alert('radio', $name, 0);
          break;

// ***** select *****

        case 'select':
          if (!isset($data[$name]))
            return form_validation_alert('select', $name, 0);
          break;

// ***** terms *****

        case 'terms':
          if (!isset($data[$name]))
            return form_validation_alert('terms', $name, 0);
          break;
      }
    }

// ***** date *****

    if ($rule[1][0] == 'date')
    {
      $year = $rule[0][0];
      $month = $rule[0][1];
      $day   = $rule[0][2];

      if (form_validation_isnan($data[$year ]))
        return form_validation_alert('date', $year, 0);
      if (form_validation_isnan($data[$month]) || $data[$month] < 0 || $data[$month] > 12)
        return form_validation_alert('date', $month, 0);
      if (form_validation_isnan($data[$day ]) || $data[$day ] < 0 || $data[$day ] > 31 || !checkdate($data[$month], $data[$day], $data[$year]))
        return form_validation_alert('date', $day,   0);
    }
}

return true;
}

[!--infotagslink--]

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