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When sorting an array, for example by using sort() there are three constants you can use to determine how the sorting will work:

• SORT_REGULAR (default) when you have mixed types of variables in the array it won't cast them. The results can be … hmm .. interesting. It will sort first all string types and them all numeric types
• SORT_NUMERIC - all elements will be casted to their numeric values
• SORT_STRING - all array elements will be sorted as strings.

Here's an example of the three options:

< ?php
echo '

';
$a = array(3, 1, '01', '011', '0001', 'a', 'a0', 'b0', '0b0', '1a1', '0a0', 'xyz', '99a', 991, '992');
sort($a, SORT_REGULAR); // default
print_r($a);
sort($a, SORT_NUMERIC);
print_r($a);
sort($a, SORT_STRING);
print_r($a);
?>
The result will be:
Array
(
    [0] => 01
    [1] => 0001
    [2] => 011
    [3] => 0a0
    [4] => 0b0
    [5] => 1a1
    [6] => 992
    [7] => 99a
    [8] => a
    [9] => a0
    [10] => b0
    [11] => xyz
    [12] => 1
    [13] => 3
    [14] => 991
)
Array
(
    [0] => a0
    [1] => a
    [2] => 0b0
    [3] => 0a0
    [4] => xyz
    [5] => b0
    [6] => 01
    [7] => 1a1
    [8] => 0001
    [9] => 1
    [10] => 3
    [11] => 011
    [12] => 99a
    [13] => 991
    [14] => 992
)
Array
(
    [0] => 0001
    [1] => 01
    [2] => 011
    [3] => 0a0
    [4] => 0b0
    [5] => 1
    [6] => 1a1
    [7] => 3
    [8] => 991
    [9] => 992
    [10] => 99a
    [11] => a
    [12] => a0
    [13] => b0
    [14] => xyz
)






	



				
				

					
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						on Tuesday, March 29th, 2005						and is filed under PHP certification.
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