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--TEST--
Test array_diff_key() function : usage variation - Passing null,unset and undefined variable indexed array
--FILE--
<?php
/* Prototype : array array_diff_key(array arr1, array arr2 [, array ...])
* Description: Returns the entries of arr1 that have keys which are not present in any of the others arguments.
* Source code: ext/standard/array.c
*/
echo "*** Testing array_diff_key() : usage variation ***\n";
// Initialise function arguments not being substituted (if any)
$input_array = array(10 => '10', "" => 'empty');
//get an unset variable
$unset_var = 10;
unset ($unset_var);
$input_arrays = array(
'null indexed' => array(NULL => 'null 1', null => 'null 2'),
'undefined indexed' => array(@$undefined_var => 'undefined'),
'unset indexed' => array(@$unset_var => 'unset'),
);
foreach($input_arrays as $key =>$value) {
echo "\n--$key--\n";
// loop through each element of the array for arr1
var_dump( array_diff_key($input_array, $value) );
var_dump( array_diff_key($value, $input_array) );
}
?>
===DONE===
--EXPECTF--
*** Testing array_diff_key() : usage variation ***
--null indexed--
array(1) {
[10]=>
string(2) "10"
}
array(0) {
}
--undefined indexed--
array(1) {
[10]=>
string(2) "10"
}
array(0) {
}
--unset indexed--
array(1) {
[10]=>
string(2) "10"
}
array(0) {
}
===DONE===
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