PHP header() 函数使用方法总结

// fix 404 pages: 用这个header指令来解决URL重写产生的404 header
header(‘HTTP/1.1 200 OK’);

// set 404 header: 页面没找到
header(‘HTTP/1.1 404 Not Found’);

// 页面被永久删除，可以告诉seo/seo.html" target="_blank">搜索引擎更新它们的urls
// set Moved Permanently header (good for redrictions)
// use with location header
header(‘HTTP/1.1 301 Moved Permanently’);
// 访问受限
header(‘HTTP/1.1 403 Forbidden’);
// 服务器错误
header(‘HTTP/1.1 500 Internal Server Error’);

// 重定向到一个新的位置
// redirect to a new location:
header(‘Location: http://www.m-bang.com);

延迟一段时间后重定向
// redrict with delay:
header(‘Refresh: 10; url=http://www.sina.com.cn’);
print ‘You will be redirected in 10 seconds’;

// 覆盖 X-Powered-By value
// override X-Powered-By: PHP:
header(‘X-Powered-By: PHP/4.4.0′);
header(‘X-Powered-By: Brain/0.6b’);

// 内容语言 (en = English)
// content language (en = English)
header(‘Content-language: en’);

//最后修改时间 (在缓存的时候可以用到)
// last modified (good for caching)
$time = time() – 60; // or filemtime($fn), etc
header(‘Last-Modified: ‘.gmdate(‘D, d M Y H:i:s’, $time).’ GMT’);

// 告诉浏览器要获取的内容还没有更新
// header for telling the browser that the content
// did not get changed
header(‘HTTP/1.1 304 Not Modified’);

// 设置内容的长度 (缓存的时候可以用到):
// set content length (good for caching):
header(‘Content-Length: 1234′);

// 用来下载文件:
// Headers for an download:
header(‘Content-Type: application/octet-stream’);
header(‘Content-Disposition: attachment; filename=”example.zip”‘);
header(‘Content-Transfer-Encoding: binary’);

// 禁止缓存当前文档:
// load the file to send:readfile(‘example.zip’);
// Disable caching of the current document:
header(‘Cache-Control: no-cache, no-store, max-age=0, must-revalidate’);
header(‘Expires: Mon, 26 Jul 1997 05:00:00 GMT’);
// 设置内容类型:
// Date in the pastheader(‘Pragma: no-cache’);
// set content type:
header(‘Content-Type: text/html; charset=iso-8859-1′);
header(‘Content-Type: text/html; charset=utf-8′);
header(‘Content-Type: text/plain’);

// plain text file
header(‘Content-Type: image/jpeg’);

// JPG picture
header(‘Content-Type: application/zip’);

// ZIP file
header(‘Content-Type: application/pdf’);

// PDF file
header(‘Content-Type: audio/mpeg’);

// Audio MPEG (MP3,…) file
header(‘Content-Type: application/x-shockwave-flash’);

// 显示登录对话框，可以用来进行HTTP认证
// Flash animation// show sign in box
header(‘HTTP/1.1 401 Unauthorized’);
header(‘WWW-Authenticate: Basic realm=”Top Secret”‘);
print ‘Text that will be displayed if the user hits cancel or ‘;
print ‘enters wrong login da
ta’;
?>

function _file_get_content($str) {
$ctx = stream_context_create(array(  
   'http' => array(  
       'timeout' => 10 //设置一个超时时间，单位为秒  
       )  
   )  
);  
return file_get_contents($str, 0, $ctx);  
}

$closure = function($param) { echo $param; };

function test(){
$test='';
$test=function ($str){
echo 'test';
return $str;
};
timeout('Y-m-d H:i:s',function ($time){
//$this->date=time();
return $time-24*60*60;
});

var_dump($test(‘hello word!’));

}
function timeout($format,$time){
echo date($format,$time(time()));
}
test();
?>

class A {
private static $sfoo = 1;
private $ifoo = 2;
}
$cl1 = static function() {
return A::$sfoo;
};
$cl2 = function() {
return $this->ifoo;
};

$bcl1 = Closure::bind($cl1, null, ‘A’);
$bcl2 = Closure::bind($cl2, new A(), ‘A’);
echo $bcl1(), “n”;
echo $bcl2(), “n”;
?>

class A1 {
function __construct($val) {
$this->val = $val;
}
function getClosure() {
//returns closure bound to this object and scope
return function() { return $this->val; };
}
}

$ob1 = new A1(1);
$ob2 = new A1(2);

$cl = $ob1->getClosure();
echo $cl(), “n”;
$cl = $cl->bindTo($ob2);
echo $cl(), “n”;
?>

$fn = function(){
return ++$this->foo; // increase the value
};

class Bar{
private $foo = 1; // initial value
}

$bar = new Bar();

$fn1 = $fn->bindTo($bar, ‘Bar’); // specify class name
$fn2 = $fn->bindTo($bar, $bar); // or object
$fn3 = $fn2->bindTo($bar); // or object

echo $fn1(); // 2
echo $fn2(); // 3
echo $fn3(); // 4

?>

$userInfo=’abc’;
if(isset($userInfo['account'])) {
$account=$userInfo['account'];
} else {
$account=$userInfo;
}

$a=’abc’;
echo $a['account'];

<?php

$var = '';

if (isset($var)) {
print "This var is set set so I will print.";
}

// 在后边的例子中，我们将使用 var_dump函数 输出 isset() 的返回值。

$a = "test";
$b = "anothertest";

var_dump( isset($a) ); // TRUE
var_dump( isset ($a, $b) ); // TRUE

unset ($a);

var_dump( isset ($a) ); // FALSE
var_dump( isset ($a, $b) ); // FALSE

$foo = NULL;
var_dump( isset ($foo) ); // FALSE

?>

<?php

$a = array ('test' => 1, 'hello' => NULL);

var_dump( isset ($a['test') ); // TRUE
var_dump( isset ($a['foo') ); // FALSE
var_dump( isset ($a['hello') ); // FALSE

// 'hello' 等于 NULL，所以被认为是未赋值的。
// 如果想检测 NULL 键值，可以试试下边的方法。
var_dump( array_key_exists('hello', $a) ); // TRUE

?>

var_dump( array_key_exists(‘hello’, $a) ); // TRUE

<?php
$weigeti=''; //这里初始参数$weigeti='';
$weigeti0=FALSE //这里初始参数为布尔FALSE
$weigeti2=NULL;  //这里定义$weigeti2=NULL，用isset()判断返回FALSE
$weigeti3=""; // 这里是NULL字节，用isset()判断，返回TRUE，不同于NULL常数
$weigeti4="www.v-get.com";  //这里定义会在下面给unset掉

if(isset($weigeti)){ echo '参数$weigeti已经设定，且值不为NULL'; }
// 参数$weigeti已经赋值，而且值为$weigeti=''，所以会输出“参数$weigeti已经设定”

if(isset($weigeti0)){ echo '参数$weigeti0已经设定，且值不为NULL'; }
// 参数$weigeti0已经赋值，而且值为$weigeti=FALSE，所以会输出“参数$weigeti已经设定”

if(isset($vget)){ echo '参数$vget已经设定，且值不为NULL'; }
// 参数$vget根本就没有被提及过，isset($vget)返回FALSE，不会输出

if(isset($weigeti2)){ echo '参数$weigeti2已经设定，且值不为NULL'; }
// 这里是$weigeti2虽然被设定了，但是$weigeti2=NULL，所以isset($weigeti2)返回FALSE，不会输出

if(isset($weigeti3)){ echo '参数$weigeti3已经设定，且值不为NULL'; }
// 参数$weigeti3 虽然 就是代表NULL字节，但是这个不是常数NULL，所以$isset("")返回TRUE，会输出

unset($weigeti4);  //这里给$weigeti4 释放掉了
if(isset($weigeti4)){ echo '参数$weigeti4已经设定，且值不为NULL'; }
// 虽然开始已经定义$weigeti4，而且还不为NULL，但是后来又给 unset() 掉了，所以不会输出。
?>

<?php
$V=array(
'WeiGeTi'=>'www.111cn.net',
'V-Get'=>array(
    'www'=>'www.v-get.com',
    'e'=>'e.v-get.com',
    'wuliu'=>array(
        'www'=>'wuliu.v-get.com',
        'yiwu'=>'www.111cn.net'
     )
   )
);

// var_dump用于输出TRUE 或 FALSE

var_dump(isset($V['WeiGeTi']));
// 数组$V 的$V['WeiGeTi'] ='www.111cn.net'已经存在，所以输出TRUE

var_dump(isset($V['V-Get']['e']));
//$V['V-Get']['e']='e.v-get.com' 所以输出 TRUE

var_dump(isset($V['V-Get']['wuliu']['yiwu']));
// $V['V-Get']['wuliu']['yiwu']='www.111cn.net'所以输出TRUE

var_dump(isset($V['V-Get']['wuliu']['sh']));
//根据数组，根本就没有设定该项，所以输出FALSE
?>

<?php
//表单传递来user用户名和 pass必须同时存在才能执行
if(isset($_POST['user'],$_POST['pass'])){
$user=$_POST['user'];
$pass=$_POST['pass'];
echo '您填写的用户名是：',$user,'；密码是：',$pass;

}
?>

<?php
//三元，等同于 if(isset($_POST['from'])){$weigeti=$_POST['from'];}else{$weiget='';}

$weigeti=isset($_POST['from'])?$_POST['from']:'';

//判断$weigeti存在，且字符串长度大于0
/* 菜鸟写法 
if(strlen($weigeti)>0){
echo '$weigeti子符长度大于0';}
*/

// 性能更优越的写法，判断$weigeti第1个字符是否设定了
if(isset($weigeti{1})){
echo '$weigeti字符长度大于0';
}
?>

<?php
$str = 'hello world';
$arr = str_split($str);
print_r($arr);
/*
Array
(
   
[0] => h
   
[1] => e
   
[2] => l
   
[3] => l
   
[4] => o
   
[5] =>
   
[6] => w
   
[7] => o
   
[8] => r
   
[9] => l
   
[10] => d
)
*/
 
$arr = str_split($str,2);
print_r($arr);
/*
Array
(
   
[0] => he
   
[1] => ll
   
[2] => o
   
[3] => wo
   
[4] => rl
   
[5] => d
)
 
*/
?>

<?php
/**
* @version $Id: str_split.php 10381 2008-06-01 03:35:53Z pasamio $
* @package utf8
* @subpackage strings
*/
function utf8_str_split($str, $split_len = 1)
{
    if (!preg_match('/^[0-9]+$/', $split_len) || $split_len < 1)
        return FALSE;
 
    $len = mb_strlen($str, 'UTF-8');
    if ($len <= $split_len)
        return array($str);
 
    preg_match_all('/.{'.$split_len.'}|[^x00]{1,'.$split_len.'}$/us', $str, $ar);
 
    return $ar[0];
}
 
$str = 'hello 你好';
 
$arr = utf8_str_split($str);
print_r($arr);
/*
Array
(
   
[0] => h
   
[1] => e
   
[2] => l
   
[3] => l
   
[4] => o
   
[5] =>
   
[6] => 你
   
[7] => 好
)
*/
?>

<?php
    $data = "e0ab71ab9ed24e627a24e7d65367936393cb3b39db9a9e84d65cd7a9254a4665";
    echo chunk_split($data, 30, "<br />");
    echo implode("<br />",str_split($data,30));
//和chunk_split效果一样
?>

<?php
//from Peter from dezzignz.com 05-Apr-2010 11:30 @ php.net
 
function mbStringToArray ($str) {
    if (empty($str)) return false;
    $len = mb_strlen($str);
    $array = array();
    for ($i = 0; $i < $len; $i++) {
        $array[] = mb_substr($str, $i, 1);
    }
    return $array;
}
 
function mb_chunk_split($str, $len, $glue) {
    if (empty($str)) return false;
    $array = mbStringToArray ($str);
    $n = 0;
    $new = '';
    foreach ($array as $char) {
        if ($n < $len) $new .= $char;
        elseif ($n == $len) {
            $new .= $glue . $char;
            $n = 0;
        }
        $n++;
    }
    return $new;
}
 
$data = "e0ab你好4e627a24e7d65367936393cb3b39db9钓鱼岛a9e84d65cd7a9254a4665";
echo mb_chunk_split($data, 30, "<br />");
?>

  <?php      
    /* A string that doesn't contain the delimiter will simply return a one-length array of the original string. */     
    $input1 = "hello";      
    $input2 = "hello,there";      
    var_dump( explode( ',', $input1 ) );    
    var_dump( explode( ',', $input2 ) );      
         
    ?>