What is the usage of substr() function in php

Usage of substr() function in php: The substr() function is used to return a part of a string. Function syntax: [substr(string, start, length)], where the parameter length is optional and is used to specify the length of the string to be returned.

#The substr() function is used to return a part of a string.

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Function syntax:

substr(string,start,length)

Parameter introduction:

• string Required. Specifies a part of the string to be returned.​

• #start Required. Specifies where in the string to begin.

Positive numbers - Start at the specified position in the string

Negative numbers - Start at the specified position from the end of the string

0 - Start at the specified position in the string Starts at the first character in

• length Optional. Specifies the length of the string to be returned. The default is until the end of the string.

Positive number - Return from the position of the start parameter

Negative number - Return from the end of the string

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Code Example:

Example 1:

<?php
echo substr("Hello world!",6);
?>

Output:

world!

Example 2:

<?php
echo substr("Hello world!",6,5);
?>

Output:

world

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