PHP array_pad function

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array_pad

(PHP 4, PHP 5)

array_pad() returns a copy of the
input padded to size specified by
pad_size with value
pad_value. If
pad_size is positive then the array is
padded on the right, if it’s negative then on the left. If the
absolute value of pad_size is less than or
equal to the length of the input then no
padding takes place.
It is possible to add most 1048576 elements at a time.

Example 1. array_pad() example

$input = array(12, 10, 9);
 
$result = array_pad($input, 5, 0);
// result is array(12, 10, 9, 0, 0)
 
$result = array_pad($input, -7, -1);
// result is array(-1, -1, -1, -1, 12, 10, 9)
 
$result = array_pad($input, 2, "noop");
// not padded

See also array_fill() and
range().