UASORT(3) 1 UASORT(3)uasort - Sort an array with a user-defined comparison function and maintain index associationSYNOPSIS
bool uasort (array &$array, callable $value_compare_func)
DESCRIPTION
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with, using a
user-defined comparison function.
This is used mainly when sorting associative arrays where the actual element order is significant.
Note
If two members compare as equal, their relative order in the sorted array is undefined.
PARAMETERS
o $array
- The input array.
o $value_compare_func
- See usort(3) and uksort(3) for examples of user-defined comparison functions.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
Basic uasort(3) example
<?php
// Comparison function
function cmp($a, $b) {
if ($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}
// Array to be sorted
$array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
print_r($array);
// Sort and print the resulting array
uasort($array, 'cmp');
print_r($array);
?>
The above example will output:
Array
(
[a] => 4
[b] => 8
[c] => -1
[d] => -9
[e] => 2
[f] => 5
[g] => 3
[h] => -4
)
Array
(
[d] => -9
[h] => -4
[c] => -1
[e] => 2
[g] => 3
[a] => 4
[f] => 5
[b] => 8
)
SEE ALSO usort(3), The comparison of array sorting functions.
PHP Documentation Group UASORT(3)
Check Out this Related Man Page
ARRAY_UINTERSECT_ASSOC(3) 1 ARRAY_UINTERSECT_ASSOC(3)array_uintersect_assoc - Computes the intersection of arrays with additional index check, compares data by a callback functionSYNOPSIS
array array_uintersect_assoc (array $array1, array $array2, [array $...], callable $value_compare_func)
DESCRIPTION
Computes the intersection of arrays with additional index check, compares data by a callback function.
Note that the keys are used in the comparison unlike in array_uintersect(3). The data is compared by using a callback function.
PARAMETERS
o $array1
- The first array.
o $array2
- The second array.
o $value_compare_func
- The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to
be respectively less than, equal to, or greater than the second.
int callback (mixed $a, mixed $b)
RETURN VALUES
Returns an array containing all the values of $array1 that are present in all the arguments.
EXAMPLES
Example #1
array_uintersect_assoc(3) example
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");
print_r(array_uintersect_assoc($array1, $array2, "strcasecmp"));
?>
The above example will output:
Array
(
[a] => green
)
SEE ALSO array_uintersect(3), array_intersect_assoc(3), array_intersect_uassoc(3), array_uintersect_uassoc(3).
PHP Documentation Group ARRAY_UINTERSECT_ASSOC(3)
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With Regards,
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