PHP中处理字符串查找和替换的函数

下面我们先来认识一下相应的函数
1、str_replace 函数

来个例子更清楚一些
<?php
$str="jiao yan shi wang zhan 6 jiu shi hao";
$nums=array("1","2","3","4","5","6","7","8","9","0");
$newstr= str_replace($nums,"X",$str);   //str_replace函数中三个参数，分别是需查找的字符、替换后的字符、原字符串
echo $str,"<br/>";
echo $newstr,"<br/>";
?>

结果是什么啦？
jiao yan shi wang zhan 6 jiu shi hao
jiao yan shi wang zhan X jiu shi hao