详解PHP字符串替换str_replace()函数四种用法

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

以上所述是江南给大家介绍的PHP字符串替换str_replace()函数四种用法，希望对大家有所帮助。