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preg_match -- ½øÐÐÕýÔò±í´ïʽƥÅä
exif_imagetype($file) ---ͼÏñÀàÐÍ£»
echo "<SCRIPT LANGUAGE='JavaScript'>alert('µÃµ½');history.back();</SCRIPT>";
exit;
date_default_timezone_set('PRC');  ±±¾©Ê±¼ä£»
bool file_exists ( string filename)
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<?php
$text = "\t\tThese are a few words :) ...  ";
echo trim($text);           // "These are a few words :) ..."
echo trim($text, " \t."); // "These are a few words :)"
// trim the ASCII control characters at the beginning and end of $binary
// (from 0 to 31 inclusive)
$clean = trim($binary, "\x00..\x1F");
?>
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<?php if(extension_loaded('mysql')?>
bool is_writable ( string filename)
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array_values() ·µ»Ø input Êý×éÖÐËùÓеÄÖµ²¢¸øÆä½¨Á¢Êý×ÖË÷Òý
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$_GET['page']=5
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/**
* ´ò¿ª¹Ø±ÕÎļþ
*/
fopen() // 2/4: 2 ¸ö±ØÑ¡²ÎÊý£¬ 4 ¸ö²ÎÊý;
fclose() // 1/1;
/**
* ¶ÁÈ¡Îļþ
*/
// ÐèÏÈÓà fopen() ´ò¿ªÎļþ²ÅÄܶÁÈ¡µÄº¯Êý£»´ÓÎļþÖ¸Õë´¦¿ªÊ¼¶ÁÈ¡
fgetc() // 1/1; ¶Áȡһ¸ö×Ö·û
fgets() // 1/2; ¶ÁȡһÐÐ
fgetss() // 1/3; ¶ÁȡһÐв¢È¥³ý HMTL ±êÇ©
fgetcsv() // 1/5; ¶ÁȡһÐв ......

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<?
$s_ht="127.0.0.1";
$s_user="root";
$s_pas="123456";
$s_data="ceshi";
if (empty($_SERVER['HTTP_X_FORWARDED_FOR']))
{
$myip = $_SERVER['REMOTE_ADDR'];
$myip = $_SERVER['REMOTE_ADDR'];
}
else {
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PHPµÄÈÕÆÚʱ¼äº¯Êýdate()

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echo date('Y-m-j');
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echo date('y-n-j');
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echo date('Y-M-j');
2007-Feb-6
echo date('Y-m-d');
2007-02-06
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