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array_key_exists() returns TRUE if the given key is set in the array. key can be any value possible for an array index. array_key_exists() also works on objects.
Note: The name of this function is key_exists() in PHP 4.0.6.
Example 2. array_key_exists() vs isset() isset() does not return TRUE for array keys that correspond to a NULL value, while array_key_exists() does.
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See also isset(), array_keys(), and in_array().
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Generated: 2007-01-26 18:00:00