PHP数组搜索 - key => string

Question

I got some trouble with in_array()

$list = array(
    "files/" => "/system/application/files/_index.php",
    "misc/chat/" => "/system/application/misc/chat/_index.php"
);

I have this $_GET['f'] which holds the string files/.
How can I search through the array for possible matches?

If the string is found in the array, then the file should be included

Thanks for any help :)

Answer 1

array_key_exists is a function that returns true of the supplied key is in the array.

if(array_key_exists( $_GET['f'], $list )) {
    echo $list[$_GET['f']];
}