get element number associative array

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get numeric index of associative array
$a = array(
'blue' => 'nice',
'car' => 'fast',
'number' => 'none'
);
var_dump(array_search('car', array_keys($a)));
var_dump(array_search('blue', array_keys($a)));
var_dump(array_search('number', array_keys($a)));

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