<?php
$test = array(1,2,3,4,5,6,7,8,9);

function array_2d($array, $col_count=2){
	$result = false;
	if(!empty($array) && is_array($array)){
		$row_count = ceil( count($array) / $col_count);
		$pointer = 0;
		for($row=0; $row < $row_count; $row++) {
			for($col=0; $col < $col_count; ++$col){
				if(isset($array[$pointer])) {
					$result[$row][$col] = $array[$pointer];
					$pointer++;
				}
			}
		}
	}
	return $result;
}
$result = array_2d($test, 3);
echo '<pre>'.print_r($result, 1).'</pre>';
?>

Function to convert a one dimensional array to two dimensional with option to specify how many columns. Returns two dimensional array on success or false on fail.

PHP Convert Single Dimensional Array to Two Dimensional

array

PHP