Online PHP editor | output for d9Q2v

<?php function test() { $orderedids=array(7, 9, 5, 3); $tags=array( new Tag(3), new Tag(7), new Tag(5), new Tag(9) ); $flipped=array_flip($orderedids); class Sorter { public $flipped; function __construct($flipped) { $this->flipped=$flipped; } function fsort($tag1, $tag2) { return $this->flipped[$tag1->id] <=> $this->flipped[$tag2->id]; if ($this->flipped[$tag1->id]<$this->flipped[$tag2->id]) return -1; else if ($this->flipped[$tag1->id]==$this->flipped[$tag2->id]) return 0; else return 1; } } $sorter=new Sorter($flipped); usort($tags, array($sorter, "fsort")); return $tags; } class Tag { public $id; function __construct($id) { $this->id=$id; } } $rtags=test(); foreach ($rtags as $tag) echo $tag->id." ";