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CreativePunch on 01/03/14

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Last Edited at 01/03/14 02:27am

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Creating a nested array from items with parent IDs

/ Published in: PHP

Creating a nested array from items with parent IDs.
This is useful for when you have a website working with multiple categories with parent categories. But it can be applied anywhere, really!

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function makeNested($source) {
	$nested = array();
 
	foreach ( $source as &$s ) {
		if ( is_null($s['parent_id']) ) {
			// no parent_id so we put it in the root of the array
			$nested[] = &$s;
		}
		else {
			$pid = $s['parent_id'];
			if ( isset($source[$pid]) ) {
				// If the parent ID exists in the source array
				// we add it to the 'children' array of the parent after initializing it.
 
				if ( !isset($source[$pid]['children']) ) {
					$source[$pid]['children'] = array();
				}
 
				$source[$pid]['children'][] = &$s;
			}
		}
	}
	return $nested;
}