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下面通过本文给大家分享PHP字符串替换str_replace()函数4种用法，具体内容如下所示：
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：该函数返回替换后的数组或者字符串(新生成的)
<?php //实例一：字符串替换字符串 $str1 = str_replace("red","black","red green yellow pink purple"); echo $str1.""; //输出结果为black green yellow pink purple?><?php //实例二：字符串替换数组键值 $arr = array("blue","red","green","yellow"); $str1 = str_replace("red","pink",$arr,$i); print_r($str1);?><?php //实例三：数组替换数组，映射替换 $arr1 = array("banana","orange"); $arr2 = array("pitaya","tomato"); $con_arr = array("apple","orange","banana","grape"); $con_rep = str_replace($arr1,$arr2,$con_arr,$count); print_r($con_rep);?><?php //实例四：如$search为数组，$replace为字符串时 $search = array("banana","grape"); $replace = "tomato"; $arr = array("banana","apple","orange","grape"); $new_arr = str_replace($search,$replace,$arr,$count); print_r($new_arr);?>总结
以上所述是小编给大家介绍的PHP字符串替换str_replace()函数四种用法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！