PHP Functions Essential Reference

is_array

bool is_array(mixed value) 

Tests whether a value is an array.

Returns:

TRUE if the value is an array; FALSE otherwise

Description:

is_array() checks whether value is an array. If it is, TRUE is returned. If not, FALSE is returned.

Availability:

UNIX, Windows

Version:

3+, 4+

See also:

gettype() 

Example:

Make sure that a function argument is an array

function print_list ($list, $dest = 'php://stdout') { // If the $list argument is not an array, then make it an array is_array ($list) or $list = array ($list); // rest of function omitted for brevity //.... }