mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )该函数返回一个字符串或者数组.该字符串或数组是将subject中全部的search都被replace替换之后的结果.1.$search,要替换的字符串,或数组2.$replace,被用来替换的字符串或数组3.$subject,被查询的字符串或数组4.$count,可选,如果被指定,将为设置为替换的次数5.返回值:该函数返回替换…