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PHP substr() Function

PHP String Reference Complete PHP String Reference

Definition and Usage

The substr() function returns a part of a string.

Syntax

substr(string,start,length)

Parameter Description
string Required. Specifies the string to return a part of
start Required. Specifies where to start in the string
  • A positive number - Start at a specified position in the string
  • A negative number - Start at a specified position from the end of the string
  • 0 - Start at the first character in string
length Optional. Specifies the length of the returned string. Default is to the end of the string.
  • A positive number - The length to be returned from the start parameter
  • Negative number - The length to be returned from the end of the string

Tips and Notes

Note: If start is a negative number and length is less than or equal to start, length becomes 0.

Example 1

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

The output of the code above will be:

world!

Example 2

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

The output of the code above will be:

world

PHP String Reference Complete PHP String Reference
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