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array_key_exists behavior


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Just wondering if someone can explain to me how this code works:



if (array_key_exists('a',array('a'))) { echo 'yes'; }



The "if" predicate doesn't evaluate to "true" as I expected, and I'm trying to understand why. TIA

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The array_key_exists() function returns whether the array has the specified key, or not. To steal a comment from the manual, "An array in PHP is … a type that associates values to keys." (http://php.net/arrays). In your example, your array has only one value "a" and its key is 0.


It looks like the function you really wanted was in_array() (http://php.net/in_array), which returns whether the array as the specified value, or not.

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