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PHP substr_compare() Function

❮ PHP String Reference

Example

Compare two strings:

<?php
echo substr_compare("Hello world","Hello world",0);
?>
Try it Yourself »

Definition and Usage

The substr_compare() function compares two strings from a specified start position.

Tip: This function is binary-safe and optionally case-sensitive.


Syntax

substr_compare(string1,string2,startpos,length,case)
Parameter Description
string1 Required. Specifies the first string to compare
string2 Required. Specifies the second string to compare
startpos Required. Specifies where to start comparing in string1. If negative, it starts counting from the end of the string
length Optional. Specifies how much of string1 to compare
case Optional. A boolean value that specifies whether or not to perform a case-sensitive compare:
  • FALSE - Default. Case-sensitive
  • TRUE - Case-insensitive


Technical Details

Return Value: This function returns:
  • 0 - if the two strings are equal
  • <0 - if string1 (from startpos) is less than string2
  • >0 - if string1 (from startpos) is greater than string2
If length is equal or greater than length of string1, this function returns FALSE.
PHP Version: 5+
Changelog: As of PHP 5.5.11 - The length parameter can be 0.
As of PHP 5.1, it is now possible to use a negative startpos.

More Examples

Example

Compare two strings, when start position in string1 for the comparison is 6th:

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

Using all parameters:

<?php
echo substr_compare("world","or",1,2);
echo substr_compare("world","ld",-2,2);
echo substr_compare("world","orl",1,2);
echo substr_compare("world","OR",1,2,TRUE);
echo substr_compare("world","or",1,3);
echo substr_compare("world","rl",1,2);
?>
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Example

Different return values:

<?php
echo substr_compare("Hello world!","Hello world!",0); // the two strings are equal
echo substr_compare("Hello world!","Hello",0); // string1 is greater than string2
echo substr_compare("Hello world!","Hello world! Hello!",0); // str1 is less than str2
?>
Try it Yourself »

❮ PHP String Reference