下面经由过程本文给人人分享PHP字符串替代str_replace()函数4种用法，具体内容以下所示：
mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )
该函数返回一个字符串或许数组。该字符串或数组是将subject中悉数的search都被replace替代以后的效果。
1、$search,要替代的字符串，或数组（引荐进修：PHP编程从入门到通晓）
2、$replace,被用来替代的字符串或数组
3、$subject,被查询的字符串或数组
4、$count，可选，假如被指定，将为设置为替代的次数
5、返回值：该函数返回替代后的数组或许字符串(新生成的)
<?php
//实例一：字符串替代字符串
$str1 = str_replace("red","black","red green yellow pink purple");
echo $str1.""; //输出效果为black green yellow pink purple
?>
<?php
//实例二：字符串替代数组键值
$arr = array("blue","red","green","yellow");
$str1 = str_replace("red","pink",$arr,$i);
print_r($str1);
?>
<?php
//实例三：数组替代数组，映照替代
$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);
?>
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