in_array() and multidimensional array

Question

I use in_array() to check whether a value exists in an array like below,

$a = array(\"Mac\", \"NT\", \"Irix\", \"Linux\");
if (in_array(\"Irix\"         


        

Answer 1

Since PHP 5.6 there is a better and cleaner solution for the original answer :

With a multidimensional array like this :

$a = array(array("Mac", "NT"), array("Irix", "Linux"))

We can use the splat operator :

return in_array("Irix", array_merge(...$a), true)

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If you have string keys like this :

$a = array("a" => array("Mac", "NT"), "b" => array("Irix", "Linux"))

You will have to use array_values in order to avoid the error Cannot unpack array with string keys :

return in_array("Irix", array_merge(...array_values($a)), true)