How to use the str_replace function to replace strings in PHP

The str_replace function in PHP can replace some characters in a string (case-sensitive). The usage is: 1. Find and replace the specified substring in the string; 2. Find and replace the specified substring in the array. Key value; 3. Use array to replace array; 4. Use string to replace array.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

str_replace() function replaces a string some characters in (case sensitive).

str_replace ( mixed $search , mixed $replace , mixed $subject [, int &$count ] )

This function returns a string or array. This string or array is the result of replacing all searches in the subject with replace.

1. $search, the string or array to be replaced
2. $replace, the string or array to be replaced
3. $subject, the string or array to be queried Array
4, $count, optional, if specified, will be set to the number of replacements
5, return value: This function returns the replaced array or string (newly generated)

4 ways to use str_replace() function

1. String replacement string

<?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
?>

Output:

2. String replacement array key value

<?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);
?>

Output:

3. Array replacement array, mapping replacement

<?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);
?>

Output:

4,

<?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,$count);
var_dump($new_arr);
?>

Output:

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