array_diff_assoc(3) [php man page]
ARRAY_DIFF_ASSOC(3) 1 ARRAY_DIFF_ASSOC(3) array_diff_assoc - Computes the difference of arrays with additional index check SYNOPSIS
array array_diff_assoc (array $array1, array $array2, [array $...]) DESCRIPTION
Compares $array1 against $array2 and returns the difference. Unlike array_diff(3) the array keys are also used in the comparison. PARAMETERS
o $array1 - The array to compare from o $array2 - An array to compare against o $... - More arrays to compare against RETURN VALUES
Returns an array containing all the values from $array1 that are not present in any of the other arrays. EXAMPLES
Example #1 array_diff_assoc(3) example In this example you see the "a" => "green" pair is present in both arrays and thus it is not in the output from the function. Unlike this, the pair 0 => "red" is in the output because in the second argument "red" has key which is 1. <?php $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red"); $array2 = array("a" => "green", "yellow", "red"); $result = array_diff_assoc($array1, $array2); print_r($result); ?> The above example will output: Array ( [b] => brown [c] => blue [0] => red ) Example #2 array_diff_assoc(3) example Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check takes place so the string representations must be the same. <?php $array1 = array(0, 1, 2); $array2 = array("00", "01", "2"); $result = array_diff_assoc($array1, $array2); print_r($result); ?> The above example will output: Array ( [0] => 0 [1] => 1 ) NOTES
Note This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_diff_assoc($array1[0], $array2[0]);. Note Ensure you pass arguments in the correct order when comparing similar arrays with more keys. The new array should be the first in the list. SEE ALSO
array_diff(3), array_diff_uassoc(3), array_udiff_assoc(3), array_udiff_uassoc(3), array_intersect(3), array_intersect_assoc(3). PHP Documentation Group ARRAY_DIFF_ASSOC(3)
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ARRAY_INTERSECT_UKEY(3) 1 ARRAY_INTERSECT_UKEY(3) array_intersect_ukey - Computes the intersection of arrays using a callback function on the keys for comparison SYNOPSIS
array array_intersect_ukey (array $array1, array $array2, [array $...], callable $key_compare_func) DESCRIPTION
array_intersect_ukey(3) returns an array containing all the values of $array1 which have matching keys that are present in all the argu- ments. PARAMETERS
o $array1 - Initial array for comparison of the arrays. o $array2 - First array to compare keys against. o $... - Variable list of array arguments to compare keys against. o $key_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 the values of $array1 whose keys exist in all the arguments. EXAMPLES
Example #1 array_intersect_ukey(3) example <?php function key_compare_func($key1, $key2) { if ($key1 == $key2) return 0; else if ($key1 > $key2) return 1; else return -1; } $array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4); $array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8); var_dump(array_intersect_ukey($array1, $array2, 'key_compare_func')); ?> The above example will output: array(2) { ["blue"]=> int(1) ["green"]=> int(3) } In our example you see that only the keys 'blue' and 'green' are present in both arrays and thus returned. Also notice that the values for the keys 'blue' and 'green' differ between the two arrays. A match still occurs because only the keys are checked. The values returned are those of $array1. SEE ALSO
array_diff(3), array_udiff(3), array_diff_assoc(3), array_diff_uassoc(3), array_udiff_assoc(3), array_udiff_uassoc(3), array_diff_key(3), array_diff_ukey(3), array_intersect(3), array_intersect_assoc(3), array_intersect_uassoc(3), array_intersect_key(3). PHP Documentation Group ARRAY_INTERSECT_UKEY(3)