PHP array_key() Function | PHP Array Functions

The array_key() function is used to search for a given value in an array and return the corresponding key. It is useful when you need to find the key for a specific value.

Key Features of array_key()

• Searches for a specific value in an array.
• Returns the key of the matched value.
• If the value is not found, it returns NULL.

Syntax of array_key()

mixed array_key(mixed $value, array $array);

Example Using array_key()

The following example demonstrates how array_key() works:

$array = ["a" => "PHP", "b" => "JavaScript", "c" => "Python"];
        
$key = array_key("JavaScript", $array);
echo "The key for 'JavaScript' is: " . $key;