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--TEST--
Test array_key_exists() function : usage variations - equality test for certain data types
--FILE--
<?php
/* Prototype : bool array_key_exists(mixed $key, array $search)
* Description: Checks if the given key or index exists in the array
* Source code: ext/standard/array.c
* Alias to functions: key_exists
*/
/*
* Pass certain data types that can be taken as a key in an array
* and test whether array_key_exists(() thinks they are equal and therefore
* returns true when searching for them
*/
echo "*** Testing array_key_exists() : usage variations ***\n";
$unset = 10;
unset($unset);
$array = array ('null' => null,
'NULL' => NULL,
'empty single quoted string' => '',
"empty double quoted string" => "",
'undefined variable' => @$undefined,
'unset variable' => @$unset);
//iterate through original array
foreach($array as $name => $input) {
$iterator = 1;
echo "\n-- Key in \$search array is : $name --\n";
$search[$input] = 'test';
//iterate through array again to see which values are considered equal
foreach($array as $key) {
echo "Iteration $iterator: ";
var_dump(array_key_exists($key, $search));
$iterator++;
}
$search = null;
}
echo "Done";
?>
--EXPECTF--
*** Testing array_key_exists() : usage variations ***
-- Key in $search array is : null --
Iteration 1: bool(true)
Iteration 2: bool(true)
Iteration 3: bool(true)
Iteration 4: bool(true)
Iteration 5: bool(true)
Iteration 6: bool(true)
-- Key in $search array is : NULL --
Iteration 1: bool(true)
Iteration 2: bool(true)
Iteration 3: bool(true)
Iteration 4: bool(true)
Iteration 5: bool(true)
Iteration 6: bool(true)
-- Key in $search array is : empty single quoted string --
Iteration 1: bool(true)
Iteration 2: bool(true)
Iteration 3: bool(true)
Iteration 4: bool(true)
Iteration 5: bool(true)
Iteration 6: bool(true)
-- Key in $search array is : empty double quoted string --
Iteration 1: bool(true)
Iteration 2: bool(true)
Iteration 3: bool(true)
Iteration 4: bool(true)
Iteration 5: bool(true)
Iteration 6: bool(true)
-- Key in $search array is : undefined variable --
Iteration 1: bool(true)
Iteration 2: bool(true)
Iteration 3: bool(true)
Iteration 4: bool(true)
Iteration 5: bool(true)
Iteration 6: bool(true)
-- Key in $search array is : unset variable --
Iteration 1: bool(true)
Iteration 2: bool(true)
Iteration 3: bool(true)
Iteration 4: bool(true)
Iteration 5: bool(true)
Iteration 6: bool(true)
Done
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