Php strnatcmp
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PHP function strnatcmp
This function compares two strings by using a natural algorithm. (Natural algorithm is a human readable form of comparsion). This function is case sensitive.
Syntax strnatcmp
- string1: string input 1
- string2: string input 2
strnatcmp(string1,string2);
Return
- 0: when two string equal.
- >0: string1 is greater than string2.
- <0: string2 is greater than string1.
Natural Algorithm
1 is less than 2, and 3 is less than 10.
- Disorder List: 1,12,11,2,40,20
- Computer ways of understand the number order:1,11,12,2,20,40
- Natural Algorithm:1,2,11,12,20,40
Example 1
<?php $str1 = 'a100pple'; $str2 = 'a2apple'; echo strnatcmp($str1, $str2); ?>
Output: First string is larger than the second string
1
Example 2
<?php $aaf1 = $aaf2 = array( 'File1', 'File2', 'File10', 'File01', 'File100', 'File21', 'File31' ); echo "Standard string comparison\n"; usort($aaf1, "strcmp"); print_r($aaf1); echo "\nNatural order string comparison\n"; usort($aaf2, "strnatcmp"); print_r($aaf2); ?>
Output
Standard string comparison
Array
(
[0] => File01
[1] => File1
[2] => File10
[3] => File100
[4] => File2
[5] => File21
[6] => File31
)
Natural order string comparison
Array
(
[0] => File01
[1] => File1
[2] => File2
[3] => File10
[4] => File21
[5] => File31
[6] => File100
)
