array_search() function is used to search for a value in an array and return the corresponding key if found.
<?php
$array = array("a" => "apple", "b" => "banana", "c" => "cherry");
$key = array_search("banana", $array);
if ($key !== false) {
echo "Key found: " . $key;
} else {
echo "Value not found";
}
?>Output:
Key found: b