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--TEST-- Test array_key_exists() function : object functionality --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 */ /* * Test basic functionality of array_key_exists() with objects */ echo "*** Testing array_key_exists() : object functionality ***\n"; class myClass { var $var1; var $var2; var $var3; function __construct($a, $b, $c = null) { $this->var1 = $a; $this->var2 = $b; if (!is_null($c)) { $this->var3 = $c; } } } echo "\n-- Do not assign a value to \$class1->var3 --\n"; $class1 = new myClass ('a', 'b'); echo "\$key = var1:\n"; var_dump(array_key_exists('var1', $class1)); echo "\$key = var3:\n"; var_dump(array_key_exists('var3', $class1)); echo "\$class1:\n"; var_dump($class1); echo "\n-- Assign a value to \$class2->var3 --\n"; $class2 = new myClass('x', 'y', 'z'); echo "\$key = var3:\n"; var_dump(array_key_exists('var3', $class2)); echo "\$class2:\n"; var_dump($class2); echo "Done"; ?> --EXPECTF-- *** Testing array_key_exists() : object functionality *** -- Do not assign a value to $class1->var3 -- $key = var1: bool(true) $key = var3: bool(true) $class1: object(myClass)#1 (3) { [%b|u%"var1"]=> %unicode|string%(1) "a" [%b|u%"var2"]=> %unicode|string%(1) "b" [%b|u%"var3"]=> NULL } -- Assign a value to $class2->var3 -- $key = var3: bool(true) $class2: object(myClass)#2 (3) { [%b|u%"var1"]=> %unicode|string%(1) "x" [%b|u%"var2"]=> %unicode|string%(1) "y" [%b|u%"var3"]=> %unicode|string%(1) "z" } Done