<META http-equiv='Content-Type' content='text/html; charset=gbk'>

<?php 
/** //www.fzitv.net */ 
$html = "<meta http-equiv='Content-Type' content='text/html; charset=gbk'>"; 
//匹配標(biāo)準(zhǔn)的meta標(biāo)簽 
$pattern = "/<meta\s+http-equiv=(\'|\")?Content-Type(\'|\")?\s+content=(\'|\")text\/html;\s+charset=(.*)(\'|\")>/i"; 
$replacement = "<meta http-equiv='Content-Type' content='text/html; charset=big5'>"; 
$result = preg_replace($pattern, $replacement, $html); 
echo htmlspecialchars($result); 
?> 

$a = '/a/b/c/d/e.php'; 
$b = '/a/b/12/34/c.php'; 

<?php
    /** by www.fzitv.net */
    $a = '/a/b/c/d/e.php';
    $b = '/a/b/13/34/c.php';
    echo getRelativePath($a, $b); //"../../12/34/"
    function getRelativePath($a,$b){
        $a2array = explode('/', $a);
        $b2array = explode('/', $b);
        $relativePath   = '';
        for( $i = 1; $i <= count($b2array)-2; $i++ ) {
        $relativePath .= $a2array[$i] == $b2array[$i] ? '../' : $b2array[$i].'/';
        }
        return $relativePath;
    }
?>

<?php
/** by www.fzitv.net */
$url = "//www.fzitv.net/abc/de/fg.php?id=1";
$path = parse_url($url);
echo pathinfo($path['path'],PATHINFO_EXTENSION);  //php
?>

/*
*@blog  //www.fzitv.net
*/
function listDir($dir = '.'){
        if ($handle = opendir($dir)) {
            while (false !== ($file = readdir($handle))) {
                if($file == '.' || $file == '..'){
                    continue;
                }
                if(is_dir($sub_dir = realpath($dir.'/'.$file))){
                    echo 'FILE in PATH:'.$dir.':'.$file.'<br>';
                    listDir($sub_dir);
                }else{
                    echo 'FILE:'.$file.'<br>';
                }
            }
            closedir($handle);
        }
}
listDir('e:\www\abc');