How do I find duplicates in a PHP array?

Question

Is there anyway to find duplicates in array values? like:-

$cars = array("Volvo", "BMW", "Toyota", "BMW", "Toyota");

As BMW and Toyota occurs twice output would be BMW and Toyota i know about array_search() but in that you have to provide what you want to search.. i can match array value with respect to key but size of array can vary, It would be great if anyone help me out.

Answer 1

One option is using array_count_values() and include only array elements with more than one values.

$cars = array("Volvo", "BMW", "Toyota", "BMW", "Toyota");

foreach( array_count_values($cars) as $key => $val ) {
    if ( $val > 1 ) $result[] = $key;   //Push the key to the array sice the value is more than 1
}

echo "<pre>";
print_r( $result );
echo "</pre>";

This will result to:

Array
(
    [0] => BMW
    [1] => Toyota
)

Doc: array_count_values()