3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?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); $sorter=new stdClass(); $sorter->flipped=$flipped; $sorter->sfunct=function($tag1, $tag2) { if ($this->flipped[$tag1->id]<$this->flipped[$tag2->id]) return -1; else if ($this->flipped[$tag1->id]==$this->flipped[$tag2->id]) return 0; else return 1; }; return usort($tags, $sorter->sfunct); } class Tag { public $id; function __construct($id) { $this->id=$id; } } $rtags=test(); foreach ($rtags as $tag) echo $tag->id." ";
based on kW5N1
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Using $this when not in object context in /in/1S33Y:18 Stack trace: #0 [internal function]: {closure}(Object(Tag), Object(Tag)) #1 /in/1S33Y(23): usort(Array, Object(Closure)) #2 /in/1S33Y(34): test() #3 {main} thrown in /in/1S33Y on line 18
Process exited with code 255.
Output for 5.3.19 - 5.6.28
Fatal error: Using $this when not in object context in /in/1S33Y on line 18
Process exited with code 255.