(PHP 4, PHP 5, PHP 7)
Sort an array using a "natural order" algorithm
bool natsort ( array &$array )
This function implements a sort algorithm that orders alphanumeric strings in the way a human being would while maintaining key/value associations. This is described as a "natural ordering". An example of the difference between this algorithm and the regular computer string sorting algorithms (used in sort()) can be seen in the example below.
Parameters:
array
The input array.
Returns:
Returns TRUE
on success or FALSE
on failure.
Changelog:
5.2.10
Zero padded numeric strings (e.g., '00005') now essentially ignore the 0 padding.
Examples:
natsort() examples demonstrating basic usage
1 2 3 4 5 6 7 8 9 10 11 | <?php $array1 = $array2 = array ( "img12.png" , "img10.png" , "img2.png" , "img1.png" ); asort( $array1 ); echo "Standard sorting\n" ; print_r( $array1 ); natsort( $array2 ); echo "\nNatural order sorting\n" ; print_r( $array2 ); ?> |
The above example will output:
Standard sorting Array ( [3] => img1.png [1] => img10.png [0] => img12.png [2] => img2.png ) Natural order sorting Array ( [3] => img1.png [2] => img2.png [1] => img10.png [0] => img12.png )
For more information see: Martin Pool's » Natural Order String Comparison page.
natsort() examples demonstrating potential gotchas
1 2 3 4 5 6 7 8 9 10 11 12 13 | <?php echo "Negative numbers\n" ; $negative = array ( '-5' , '3' , '-2' , '0' , '-1000' , '9' , '1' ); print_r( $negative ); natsort( $negative ); print_r( $negative ); echo "Zero padding\n" ; $zeros = array ( '09' , '8' , '10' , '009' , '011' , '0' ); print_r( $zeros ); natsort( $zeros ); print_r( $zeros ); ?> |
The above example will output:
Negative numbers Array ( [0] => -5 [1] => 3 [2] => -2 [3] => 0 [4] => -1000 [5] => 9 [6] => 1 ) Array ( [2] => -2 [0] => -5 [4] => -1000 [3] => 0 [6] => 1 [1] => 3 [5] => 9 ) Zero padding Array ( [0] => 09 [1] => 8 [2] => 10 [3] => 009 [4] => 011 [5] => 0 ) Array ( [5] => 0 [1] => 8 [3] => 009 [0] => 09 [2] => 10 [4] => 011 )
See also:
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