An array that is padded from the front

 
<?
    $weights = array (1, 3, 5, 10, 15, 25, 50);
    $weights = array_pad($weights, -10, 100);
    print_r($weights);
?>

1.	Add new values to the beginning of the array by using a negative value for $size:
2.	Setting an Array's Size: array array_pad(array $input, int $size, mixed $value)
3.	Using array_pad() with associative arrays
4.	array_pad 1
5.	array_pad 2
6.	array_pad 3
7.	array_pad() function expands an array to a precise size, padding it with a default value.
8.	Pad array to the specified length with a value

An array that is padded from the front : array_pad « Data Structure « PHP