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    if ($_POST['some'] ²»Âú×ã condition) {
             die("wrong");
    }
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    <form method=post action=act.php>
        ÐÕÃû£º<input type=text name='name'><br>
        ÄêÁ䣺<inupt type=text name='uage' ><br>
        <input type=submit value="Ìá½»">
    </form>
    act.phpÖн«ÊµÏÖ±íµ¥µÄÑéÖ¤£º
    $userinfo = array();                 // ²½Öè1
    $userinfo['name'] = isset($_POST['uname']) ? $_POST['uname'] : '';
    $userinfo['age'] = isset($_POST['uage']) ? (int)$_POST['uage'] : 0;
    $error_message = "";           // ´íÎóÐÅÏ¢
    // ²½Öè2
    $elems = array(
        array("\$userinfo['name']", 'strlen(#)<1', 'ÐÕÃû²»ÄÜΪ¿Õ!'),
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phpÁ¬½Ómysql²âÊÔ´úÂ룺
$link=mysql_connect('localhost','root','123456');
if(!$link) echo "ʧ°Ü!";
else echo "³É¹¦!";
mysql_close();
?>
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PHP ɾ³ýij¸öĿ¼ÏÂNÌìǰµÄËùÓÐÎļþ

<?php
function delfile($dir,$n) //ɾ³ýDIR·¾¶ÏÂNÌìǰ´´½¨µÄËùÓÐÎļþ;
{
if(is_dir($dir))
{
if($dh=opendir($dir))
{
while (false !== ($file = readdir($dh)))
{
if($file!="." && $file!="..")
{
$fullpath=$dir."/".$file;
if(!is_dir($fullpath)) ......

RedhatÏ Apache, php, mysqlµÄĬÈϰ²×°Â·¾¶

apache:
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apacheÅäÖÃÎļþ:/etc/httpd/conf/httpd.conf
ApacheÄ£¿é·¾¶£º/usr/sbin/apachectl
webĿ¼:/var/www/html
Èç¹û²ÉÓÃÔ´´úÂë°²×°£¬Ò»°ãĬÈϰ²×°ÔÚ/usr/local/apache2Ŀ¼ÏÂ
php:
Èç¹û²ÉÓÃRPM°ü°²×°£¬°²×°Â·¾¶Ó¦ÔÚ /etc/Ŀ¼ÏÂ
phpµÄÅäÖÃÎļþ:/etc/php.ini ......
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