How to use str_replace function in php

Usage of str_replace function in php: [str_replace($searchVal, $replaceVal, $subjectVal, $count)]. The str_replace() function is used to replace strings or arrays.

str_replace() is a built-in function in PHP, which is used to replace strings or arrays and replace characters in strings or arrays with other characters. A number of characters (case sensitive).

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How to use the str_replace function in php?

php str_replace() function is used to perform string replacement operations and is case-sensitive.

Basic syntax:

str_replace ( $searchVal, $replaceVal, $subjectVal, $count )

Parameters: This function accepts four parameters, 3 of which are mandatory and 1 is optional. All these parameters are described below:

●　$searchVal: This parameter can be of string and array type. This parameter specifies the string to search and replace. $replaceVal: This parameter can be of string and array type. This parameter specifies the string to be used to replace the

●　$searchVal string.

●　$subjectVal: This parameter can be of string and array type. This parameter specifies the string or array of strings we want to search for $searchVal and replace with $replaceVal.

● $count: This parameter is optional, if passed, its value will be set to the total number of replacement operations performed on the string $subjectVal.

The function must follow the following rules:

● If the $searchVal and $replaceVal parameters are arrays, then all elements of the $searchVal parameter are in the $subjectVal string Searched for, and replaced by the corresponding element in the $replaceVal parameter.

● If the number of elements in $replaceVal is less than the number of elements in the $searchVal array, then if other elements of the $searchVal parameter in the $subjectVal parameter are present, they will be replaced by the empty string.

● If the $subjectVal parameter is also an array rather than a string, then all elements of $subjectVal will be searched.

Return value: This function returns a string or array based on the $subjectVal parameter with a replacement value.

Let’s take a look at how to use the php str_replace() function through an example.

Example 1:

<?php
echo str_replace("world","php.cn","Hello world!");
?>

Output:

Hello php.cn!

Example 2:

<?php
$i = "i like JavaScript";
echo str_replace("JavaScript","php",$i);
?>

Output:

i like php

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