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1.1     ! misho       1: --TEST--
        !             2: Test function key_exists() by calling it with its expected arguments
        !             3: --CREDITS--
        !             4: Francesco Fullone ff@ideato.it
        !             5: #PHPTestFest Cesena Italia on 2009-06-20
        !             6: --FILE--
        !             7: <?php
        !             8: echo "*** test key_exists() by using mixed type of arrays ***\n";
        !             9: 
        !            10: // there is not a index = 0 element
        !            11: $a = array(1 => 'bar', 'foo' => 'baz');  
        !            12: var_dump(key_exists(0, $a));
        !            13: 
        !            14: echo "integer\n";
        !            15: // 1 has index = 0
        !            16: $b = array(1, 'foo' => 'baz');  
        !            17: var_dump(key_exists(0, $b));
        !            18: 
        !            19: // 42 has index = 0, netherless its position is the latest
        !            20: $c = array('foo' => 'baz', 42);  
        !            21: var_dump(key_exists(0, $c));
        !            22: 
        !            23: echo "string\n";
        !            24: // 'bar' has index = 0, netherless it is a string
        !            25: $d = array('bar', 'foo' => 'baz');  
        !            26: var_dump(key_exists(0, $d));
        !            27: 
        !            28: // 'baz' has index = 0, netherless its position is the latest
        !            29: $e = array('foo' => 'baz', 'baz');  
        !            30: var_dump(key_exists(0, $e));
        !            31: 
        !            32: echo "obj\n";
        !            33: class ObjectA
        !            34: {
        !            35:   public $foo = 'bar';
        !            36: }
        !            37: 
        !            38: $obj = new ObjectA();
        !            39: 
        !            40: // object has index = 0, netherless its position is the latest
        !            41: $f = array('foo' => 'baz', $obj);  
        !            42: var_dump(key_exists(0, $f));
        !            43: 
        !            44: // object has index = 0, netherless its position is the first
        !            45: $g = array($obj, 'foo' => 'baz');  
        !            46: var_dump(key_exists(0, $g));
        !            47: 
        !            48: echo "stream resource\n";
        !            49: // stream resource has index = 0, netherless its position is the first
        !            50: $st = fopen('php://memory', '+r');
        !            51: $h = array($st, 'foo' => 'baz');  
        !            52: var_dump(key_exists(0, $h));
        !            53: 
        !            54: // stream resource has index = 0, netherless its position is the latest
        !            55: $i = array('foo' => 'baz', $st);  
        !            56: var_dump(key_exists(0, $i));
        !            57: 
        !            58: --EXPECTF--
        !            59: *** test key_exists() by using mixed type of arrays ***
        !            60: bool(false)
        !            61: integer
        !            62: bool(true)
        !            63: bool(true)
        !            64: string
        !            65: bool(true)
        !            66: bool(true)
        !            67: obj
        !            68: bool(true)
        !            69: bool(true)
        !            70: stream resource
        !            71: bool(true)
        !            72: bool(true)