详解str_replace()子字符串替换函数

str_replace   ( mixed $search   , mixed $replace   , mixed $subject   , int &$count = ?   )

<?php
$str="Chinese php.com is better";
$str2 = str_replace("com", "cn",$str,$count);
echo $str.",经过".$count."次替换后，变为：".$str2;
?>

输出：Chinese php.com is better,经过1次替换后，变为：Chinese php.cn is better

<?php
$search  = array(&#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;);
$replace = array(&#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39;);
$subject = &#39;A&#39;;
echo str_replace($search, $replace, $subject);

输出：F