Example
The function is_array() returns true if a variable is an array.
$integer = 1337;
$array = [1337, 42];
is_array($integer); // false
is_array($array); // true
You can type hint the array type in a function to enforce a parameter type; passing anything else will result in a fatal error.
function foo (array $array) { /* $array is an array */ }
You can also use the gettype() function.
$integer = 1337;
$array = [1337, 42];
gettype($integer) === 'array'; // false
gettype($array) === 'array'; // true
