非常实用的PHP代码片段(重点推荐)

$meta = get_meta_tags('http://www.111cn.net/');
$keywords = $meta['keywords'];
// 分割关键词
$keywords = explode(',', $keywords );
// 整理
$keywords = array_map( 'trim', $keywords );
// 去掉空内容
$keywords = array_filter( $keywords );

print_r( $keywords );

$html = file_get_contents('http://www.111cn.net');

$dom = new DOMDocument();
@$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
$hrefs = $xpath->evaluate("/html/body//a");

for ($i = 0; $i < $hrefs->length; $i++) {
       $href = $hrefs->item($i);
       $url = $href->getAttribute('href');
       echo $url.'<br />';
}

function _make_url_clickable_cb($matches) {
 $ret = '';
 $url = $matches[2];
 
 if ( empty($url) )
  return $matches[0];
 // 去掉 URL 后面的标点符号
 if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {
  $ret = substr($url, -1);
  $url = substr($url, 0, strlen($url)-1);
 }
 return $matches[1] . "<a href="$url" rel="nofollow">$url</a>" . $ret;
}
 
function _make_web_ftp_clickable_cb($matches) {
 $ret = '';
 $dest = $matches[2];
 $dest = 'http://' . $dest;
 
 if ( empty($dest) )
  return $matches[0];
 if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {
  $ret = substr($dest, -1);
  $dest = substr($dest, 0, strlen($dest)-1);
 }
 return $matches[1] . "<a href="$dest" rel="nofollow">$dest</a>" . $ret;
}
 
function _make_email_clickable_cb($matches) {
 $email = $matches[2] . '@' . $matches[3];
 return $matches[1] . "<a href="mailto:$email">$email</a>";
}
 
function make_clickable($ret) {
 $ret = ' ' . $ret;
 $ret = preg_replace_callback('#([s>])([w]+?://[w\x80-\xff#$%&~/.-;:=,?@[]+]*)#is', '_make_url_clickable_cb', $ret);
 $ret = preg_replace_callback('#([s>])((www|ftp).[w\x80-\xff#$%&~/.-;:=,?@[]+]*)#is', '_make_web_ftp_clickable_cb', $ret);
 $ret = preg_replace_callback('#([s>])([.0-9a-z_+-]+)@(([0-9a-z-]+.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret);
 
 $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);
 $ret = trim($ret);
 return $ret;
}

function data_uri($file, $mime) {
  $contents=file_get_contents($file);
  $base64=base64_encode($contents);
  echo "data:$mime;base64,$base64";
}

function cleanHTML($html) {

// 首先去掉无用的标签（可以自定义更多需要清除的标签）

$html = ereg_replace("<(/)?(font|span|del|ins)[^>]*>","",$html);

// 然后再运行两遍去掉无用属性

$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<1>",$html);
$html = ereg_replace("<([^>]*)(class|lang|style|size|face)=("[^"]*"|'[^']*'|[^>]+)([^>]*)>","<1>",$html);

return $html
}

$name = "post_url";
$value =  "";
setcookie($name, $value,  time()+60*60*3, "/" );

delete_cookie

173 PHP_FUNCTION(setcookie)
174 {
175     char *name, *value = NULL, *path = NULL, *domain = NULL;
176     long expires = 0;
177     zend_bool secure = 0, httponly = 0;
178     int name_len, value_len = 0, path_len = 0, domain_len = 0;
179
180     if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|slssbb", &name,
181                               &name_len, &value, &value_len, &expires, &path,
182                               &path_len, &domain, &domain_len, &secure, &httponly) ==

FAILURE) {
183         return;
184     }
185
186     if (php_setcookie(name, name_len, value, value_len, expires, path, path_len, domain,

domain_len, secure, 1, httponly TSRMLS_CC) == SUCCESS) {
187         RETVAL_TRUE;
188     } else {
189         RETVAL_FALSE;
190     }  
191 }      
 
 
 
 76 PHPAPI int php_setcookie(char *name, int name_len, char *value, int value_len, time_t

expires, char *path, int path_len, char *domain, int domain_len, int secure, int url_encode,

int httponly TSRMLS_DC)
 77 {
 78     char *cookie, *encoded_value = NULL;
 79     int len=sizeof("Set-Cookie: ");
 80     char *dt;
 81     sapi_header_line ctr = {0};
 82     int result;
 83
 84     if (name && strpbrk(name, "=,; trn1314") != NULL) {   /* man isspace for 13

and 14 */
 85         zend_error( E_WARNING, "Cookie names cannot contain any of the following '=,;

\t\r\n\013\014'" );
 86         return FAILURE;
 87     }
 88
 89     if (!url_encode && value && strpbrk(value, ",; trn1314") != NULL) { /* man

isspace for 13 and 14 */
 90         zend_error( E_WARNING, "Cookie values cannot contain any of the following ',;

\t\r\n\013\014'" );
 91         return FAILURE;
 92     }
 93
 94     len += name_len;
 95     if (value && url_encode) {
 96         int encoded_value_len;
 97
 98         encoded_value = php_url_encode(value, value_len, &encoded_value_len);
 99         len += encoded_value_len;
100     } else if ( value ) {
101         encoded_value = estrdup(value);
102         len += value_len;
103     }
104     if (path) {
105         len += path_len;
106     }
107     if (domain) {
108         len += domain_len;
109     }
110
111     cookie = emalloc(len + 100);
112
113     if (value && value_len == 0) {
114         /*
115          * MSIE doesn't delete a cookie when you set it to a null value
116          * so in order to force cookies to be deleted, even on MSIE, we
117          * pick an expiry date in the past
118          */
119         dt = php_format_date("D, d-M-Y H:i:s T", sizeof("D, d-M-Y H:i:s T")-1, 1, 0

TSRMLS_CC);
120         snprintf(cookie, len + 100, "Set-Cookie: %s=deleted; expires=%s", name, dt);
121         efree(dt);
122     } else {
123         snprintf(cookie, len + 100, "Set-Cookie: %s=%s", name, value ? encoded_value :

"");
124         if (expires > 0) {
125             const char *p;
126             strlcat(cookie, "; expires=", len + 100);
127             dt = php_format_date("D, d-M-Y H:i:s T", sizeof("D, d-M-Y H:i:s T")-1,

expires, 0 TSRMLS_CC);
128             /* check to make sure that the year does not exceed 4 digits in length */
129             p = zend_memrchr(dt, '-', strlen(dt));
130             if (!p || *(p + 5) != ' ') {

function wpjam_minify_html($html) {

    $search = array(
        '/>[^S ]+/s',  // 删除标签后面空格
        '/[^S ]+</s',  // 删除标签前面的空格
        '/(s)+/s'       // 将多个空格合并成一个
    );

    $replace = array(
        '>',
        '<',
        '\1'
    );

    $html = preg_replace($search, $replace, $html);

    return $html;
}

if(!is_admin()){
 add_action("wp_loaded", 'wp_loaded_minify_html');
 function wp_loaded_minify_html(){
  ob_start('wpjam_minify_html');
 }
}

$temppath=$upfile['tmp_name'];
   $fileinfo=pathinfo($upfile['name']);
   $extension=$upfile['type'];
   //echo $extension;
   //exit;
   switch( $extension )
   {
    case 'application/msword':
    $extension ='doc';
    break;
    case 'application/vnd.ms-excel':
    $extension ='xls';
    break;
    case 'application/vnd.openxmlformats-officedocument.wordprocessingml.document':
    $extension ='docx';
    break;
    case 'application/vnd.ms-powerpoint':
    $extension ='ppt';
    break;
    case 'application/pdf':
    $extension ='pdf';
    break;
    case 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet':
    $extension ='xlsx';
    break;
    default:
    die('只允许上传doc,docx,xls,pdf,ppt文件 <a href="a.php">重新上传</a>');
   
   }

<div id="search">
<input type="text" name="k" />&nbsp;<input type="button" name="s" value="搜索" />
</div>
<div id="search_auto"></div>

#search{font-size:14px;}
#search .k{padding:2px 1px; width:320px;} /*将搜索框宽度设置大点*/

#search_auto{border:1px solid #817FB2; position:absolute;} /*设置边框、定位方式*/

$(‘#search_auto’).css({‘width’:$(‘#search input[name="k"]‘).width()+4});

$('#search input[name="k"]').keyup(function(){
$.post('search_auto.php',{'value':$(this).val()},function(data){　 //向服务器上的search_auto.php发送post数据，$.post是jQuery的方法
if(data=='0') $('#search_auto').html('').css('display','none');　 //判断服务器上返回的数据，如果等于０，则表示没有找到相关的内容，所以将提示框的内容清空并隐藏
else $('#search_auto').html(data).css('display','block');　 //如果服务器上返回的数据不等于０，则将返回的内容放到提示框内并显示提示框
});
});

<?php
$v=$_POST[value];
$re=mysql_query("select * from test where title like '%$v%' order by addtime desc limit 10");　 //根据客户端发送来的数据，到数据库中查询10条相关的结果
if(mysql_num_rows($re)<=0) exit('0');　 //判断查询结果，如果没有相关的结果，那么直接返回0
echo '<ul>';
while($ro=mysql_fetch_array($re)) echo '<li><a href="">'.$ro[title].'</a></li>';　 //将查询得到的相关结果的标题输出，这个地方需要注意，由于通过jQuery的ajax技术返回的文本是UTF-8编码，所以如果$ro[title] 中包含中文，一定要记得用PHP的iconv或其它函数将其转换成UTF-8编码，否则在页面中看到的会是一串乱码
echo '<li><a href="javascript:;" onclick="$(this).parent().parent().parent().fadeOut(100)">关闭</a& gt;</li>';　 //输入一个关闭按钮，让用户不想看到提示层时可以点击关闭，关闭按钮采用jQuery，解释一下，当前点击的按钮是$(this)，一直向上找到其第三个父元素，让它逐渐消失
echo '</ul>';
?>

#search_auto li{background:#FFF; text-align:left;} /*设置提示框内的li标签效果*/
#search_auto li.cls{text-align:right;} /*设置提示框内的关闭按钮效果*/
#search_auto li a{display:block; padding:5px 6px; cursor:pointer; color:#666;} /*设置提示框内li标签下的a标签效果*/
#search_auto li a:hover{background:#D8D8D8; text-decoration:none; color:#000;} /*当鼠标移入提示框内时的效果*/

<html>
<head>
<style>
#search{font-size:14px;}
#search .k{padding:2px 1px; width:320px;}
#search_auto{border:1px solid #817FB2; position:absolute; display:none;}
#search_auto li{background:#FFF; text-align:left;}
#search_auto li.cls{text-align:right;}
#search_auto li a{display:block; padding:5px 6px; cursor:pointer; color:#666;}
#search_auto li a:hover{background:#D8D8D8; text-decoration:none; color:#000;}
</style>
<title>jquery+php实现用户输入搜索内容时自动提示</title>
</head>

<body>
<div id="search">
<input type="text" name="k" />&nbsp;<input type="button" name="s" value="搜索" />
</div>
<div id="search_auto"></div>
</body>
</html>

<script src="jQuery.js"></script>
<script>
$(function(){

$('#search_auto').css({'width':$('#search input[name="k"]').width()+4});
$('#search input[name="k"]').keyup(function(){
$.post('search_auto.php',{'value':$(this).val()},function(data){
if(data=='0') $('#search_auto').html('').css('display','none');
else $('#search_auto').html(data).css('display','block');
});
});

});
</script>

<?php
$v=$_POST[value];
$re=mysql_query("select * from test where title like '%$v%' order by addtime desc limit 10");
if(mysql_num_rows($re)<=0) exit('0');
echo '<ul>';
while($ro=mysql_fetch_array($re)) echo '<li><a href="">'.$ro[title].'</a></li>';
echo '<li><a href="javascript:;" onclick="$(this).parent().parent().parent().fadeOut(100)">关闭</a& gt;</li>';
echo '</ul>';
?>

<link rel="stylesheet" href="/css/v2/jquery.input_complete.css" type="text/css" />
<script src="/js/v2/jquery.input_complete.js" type="text/javascript" ></script>

<script type="text/javascript">
  $(function(){
   $("#tt").bigAutocomplete({width:176,data:[{title:"育龙铭居",result:"5993192"},{title:"鸿威·翡翠城",result:"5993191"},{title:"海淀区吴家场项目",result:"5993190"},{title:"石景山刘娘府C1C2限价房地块",result:"5993189"},{title:"远洋密云地块",result:"5993188"},{title:"梨园镇砖厂村居住项目",result:"5993187"},{title:"马坡镇新城9号地",result:"5992450"},{title:"京西·金泰丽湾",result:"5992449"}],callback:function(data){
    $("#s_loupan").val(data.result);
    
   }});   
  
  })
</script>

<input type="text" id="tt" class="sel_quy" autocomplete="off" />