PHP substr_compare() Function
Example
Compare two strings:
<?php
echo substr_compare("Hello world","Hello world",0);
?>
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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 Values
| 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:
|
Technical Details
| Return Value: | This function returns:
|
|---|---|
| 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
?>
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