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