亲兄弟救救我吧!!!!!!

[lclmdj]

用什么方法可以实现在一个字符串中,查找某一个字符如:?出现两次,然后用&替换掉.

[孟子E章]

正则

[johnpanq]

$string ="Where are you? Where are you?";
echo str_replace("?","&",$string);