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This article mainly introduces PHP to realize that each keyword only needs to be replaced once. Interested friends can refer to it. I hope it will be helpful to everyone.
(1) Use the preg_replace function to implement this function. Because the preg_replace function itself can control the number of replacements, I thought of it from the beginning. The specific implementation method is as follows:
//可以实现替换次数的控制,不仅限于只替换一次,比如$limit为2的时候表示一个词出现很多吃的时候仅替换2次,-1表示全部替换。$search 和 $replace 都可以是字符串或者数组,但必须对应 function str_replace_limit($search,$replace,$content,$limit=-1){ if(is_array($search)){ foreach ($search as $k=>$v){ $search[$k]='`'.preg_quote($search[$k],'`').'`'; } }else{ $search='`'.preg_quote($search,'`').'`'; } //把图片描述去掉 $content=preg_replace("/alt=([^ >]+)/is",'',$content); return preg_replace($search,$replace,$content,$limit); }
(2) Use the substr_replace function to implement, but only one replacement can be achieved here
//首先找到关键字所在位置,然后使用 substr_replace(系统函数)进行替换操作 function str_replace_once($search,$replace,$content){ //把图片描述去掉 $content=preg_replace("/alt=([^ >]+)/is",'',$content); $pos=strpos($content,$search); if($pos===false){ return $haystack; } return substr_replace($content,$replace,$pos,strlen($search)); }
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