How to use substr function

PHP substr function: Returns the substring of a string.

php substr() function syntax

Function: intercept string

Syntax:

substr(string,start,length)

Parameters:

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

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

length Optional. Specifies the length of the returned string. The default is until the end of the string. Positive number - the length returned from the position of the start parameter, negative number - the length returned from the end of the string.

Description: Return part of the string. If the start parameter is negative and length is less than or equal to start, length is 0.

php substr() function usage example 1:

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

Output:

world

php substr() function usage example 2:

<?php
$i = "i&#39;m study in php.cn";
echo substr($i,8);
?>

Output:

y in php.cn

This article is an introduction to the PHP substr function. I hope it will be helpful to friends in need!

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