Usage and Examples of PHP substr_compare() Function

PHP String String Functions Manual

The substr_compare() function is used to compare two strings from the specified starting position.

Syntax

substr_compare(string1,string2,start position,length,case)

定义和用法

　Definition and Usage1 substr_compare() compares string from the offset position startpos2, comparing the length of length characters.

returns the value

if string1 the substring starting from the offset position startpos is less than string2, then it returns a number less than 0; if greater than string2, then it returns a number greater than 0; if they are equal, then it returns 0. If startpos is greater than or equal to string1 length or length is set to less than 1 value (PHP 5.5.11 In earlier versions), substr_compare() will print a warning message and return FALSE.

Parameter

Online Example

Try the following example, comparing two strings when string1 the starting position used for comparison is 6 :

<?php
　　　　//Comparing two strings, when string1　the starting position used for comparison is　6　at
　　　　echo substr_compare("SAi RAM", "RAM",6);
　　　　echo '<br>';
　　　　//Comparing Strings with Different Parameters
　　　　echo substr_compare("abcde", "bc",　1,　2);　//　0
　　　　echo '<br>';
　　　　echo substr_compare("abcde", "de",　-2,　2);　//　0
　　　　echo '<br>';
　　　　echo substr_compare("abcde", "bcg",　1,　2);　//　0
　　　　echo '<br>';
　　　　echo substr_compare("abcde", "BC",　1,　2, true);　//　0
　　　　echo '<br>';
　　　　echo substr_compare("abcde", "bc",　1,　3);　//　1
　　　　echo '<br>';
　　　　echo substr_compare("abcde", "cd",　1,　2);　//　-1
　　　　echo '<br>';
　　　　echo substr_compare("abcde", "abc",　5,　1);　//　warning　　　
?>

Output Result

-5
0
0
0
0
1
-1
PHP Warning: substr_compare(): The start position cannot exceed the initial string...

PHP String String Functions Manual