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<?php function array_partition($array, $callback, $recursive = true) { $ret = array (); $walk = ($recursive) ? 'array_walk_recursive' : 'array_walk'; $walk ( $array, function ($value, $key) use($callback, &$ret) { $index = call_user_func_array ( $callback, array ( $value, $key ) ); if (isset ( $ret [$index] )) $ret [$index] [] = $value; else $ret [$index] = array ( $value ); } ); return $ret; } $p1 = (object) array(a=>1,b=>2); $p2 = (object) array(a=>1,b=>3); $p3 = (object) array(a=>2,b=>4); $posts[] = $p1; $posts[] = $p2; $posts[] = $p3; $posts = array_partition($posts, function ($post, $i) { return $post->a; }, false); print_r($posts); ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught Error: Undefined constant "a" in /in/UjBSG:22 Stack trace: #0 {main} thrown in /in/UjBSG on line 22
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught Error: Undefined constant "a" in /in/UjBSG:22 Stack trace: #0 {main} thrown in /in/UjBSG on line 22
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/UjBSG on line 22 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/UjBSG on line 22 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/UjBSG on line 23 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/UjBSG on line 23 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/UjBSG on line 24 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/UjBSG on line 24 Array ( [1] => Array ( [0] => stdClass Object ( [a] => 1 [b] => 2 ) [1] => stdClass Object ( [a] => 1 [b] => 3 ) ) [2] => Array ( [0] => stdClass Object ( [a] => 2 [b] => 4 ) ) )
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Notice: Use of undefined constant a - assumed 'a' in /in/UjBSG on line 22 Notice: Use of undefined constant b - assumed 'b' in /in/UjBSG on line 22 Notice: Use of undefined constant a - assumed 'a' in /in/UjBSG on line 23 Notice: Use of undefined constant b - assumed 'b' in /in/UjBSG on line 23 Notice: Use of undefined constant a - assumed 'a' in /in/UjBSG on line 24 Notice: Use of undefined constant b - assumed 'b' in /in/UjBSG on line 24 Array ( [1] => Array ( [0] => stdClass Object ( [a] => 1 [b] => 2 ) [1] => stdClass Object ( [a] => 1 [b] => 3 ) ) [2] => Array ( [0] => stdClass Object ( [a] => 2 [b] => 4 ) ) )
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