How to use the substr_replace function in php

Usage of substr_replace function in php: [substr_replace(string,replacement,start,length)]. The substr_replace() function is used to replace part of a string with another string.

php The substr_replace function is used to replace a certain string in a string with another string. Its syntax is substr_replace(string,replacement,start,length).

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How to use the php substr_replace function?

Function: Replace a certain string in a string with another string.

Syntax:

substr_replace(string,replacement,start,length)

Parameters:

string Required. Specifies the string to check.

replacement Required. Specifies the string to be inserted.

start Required. Specifies where in the string to begin replacement. Positive number - starts replacement at the specified position in the string, negative number - starts replacement at the specified position from the end of the string, 0 - starts replacement at the first character in the string.

length Optional. Specifies how many characters to replace. The default is the same as the string length. Positive number - the length of the string to be replaced, negative number - the number of characters from the end of the string to be replaced from the end of the substring to be replaced. 0 - Insert instead of replace

Description:

Replace part of a string with another string. If the start argument is negative and length is less than or equal to start, length is 0. This function is binary safe.

php substr_replace() function usage example 1

<?php
echo substr_replace("Hello world","php.cn",6);
?>

Output:

Hello php.cn

php substr_replace() function usage example 2

<?php
$i = "i like JavaScript";
echo substr_replace($i,"php",7);
?>

Output:

i like php

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