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$str="hello ,my email is [email] ,keep in contact!!"; //ÎÒÒªÓÃÕýÔòÆ¥Åä³ö[email],²¢°ÑËüÌæ»»³ÉemailµÄ×Ö·û³¤¶È£¬¼´5£¬
Ò²¾ÍÊÇËµÌæ»»ÍêºóÓ¦¸Ã±äΪhello ,my email is 5 ,keep in contact!!

$str1=preg_replace('/\[(\w+)\]/',strlen('$1'),$str);
echo $str1;

//Êä³öµÄÈ´ÊÇhello ,my email is 2 ,keep in contact!!
Ò²¾ÍÊÇ˵Ëü°Ñ'$1'µ±È»×Ö·û´®À´´«µÝÁË£¬µ«ÊÇÎÒÊÔÁ˰Ñstrlen('$1')»»³Éstrlen($1)ÓÖ»á³ö´í£¬ÓÃeval()È¥ÐÞ¸ÄËüÒ²²»ÐÐ

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ÓÃpreg_replace_callback£¬¾ßÌå²Î¼ûÊÖ²á
PHP code:
<?php
// ´ËÎı¾ÊÇÓÃÓÚ 2002 ÄêµÄ£¬
// ÏÖÔÚÏëʹÆäÄÜÓÃÓÚ 2003 Äê
$text = "April fools day is 04/01/2002\n";
$text.= "Last christmas was 12/24/2001\n";

// »Øµ÷º¯Êý
function next_year($matches) {
// ͨ³££º$matches[0] ÊÇÍêÕûµÄÆ¥ÅäÏî
// $matches[1] ÊǵÚÒ»¸öÀ¨ºÅÖеÄ×ÓģʽµÄÆ¥ÅäÏî
// ÒÔ´ËÀàÍÆ
return $matches[1].($matches[2]+1);
}

echo preg_replace_callback(
"|(\d{2}/\d{2}/)(\d{4})|",
"next_year",
$text);

// ½á¹ûΪ£º
// April fools day is 04/01/2003
// Last christmas was 12/24/2002
?>


$str="hello ,


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