以下透過本文給大家分享PHP字串取代str_replace()函數4種用法，具體內容如下：
mixed str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )
該函數傳回一個字串或陣列。該字串或陣列是將subject中全部的search都被replace替換之後的結果。
1、$search,要替換的字串，或陣列（推薦學習：PHP程式設計從入門到精通）
2、$replace,被用來替換的字串或陣列
3、$subject,被查詢的字串或陣列
4、$count，可選，如果被指定，將為設定為替換的次數
5、傳回值：此函數傳回已取代的陣列或字串(新產生的)
<?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);
?>以上是php替換字串用什麼函數的詳細內容。更多資訊請關注PHP中文網其他相關文章！