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<?php $array = array( 55 => array( 'ident' => 'test 1', 'depth' => 1, ), 77 => array( 'parent_id' => 55, 'ident' => 'test 2', 'depth' => 2, ), 109 => array( 'parent_id' => 77, 'ident' => 'test 3', 'depth' => 3, ), 78 => array( 'parent_id' => 55, 'ident' => 'test 4', 'depth' => 2, ), 25 => array( 'ident' => 'test 5', 'depth' => 1, ) ); function v1($array) { foreach ($array as $key => &$sub) { if (isset($sub['parent_id'])) { $array[$sub['parent_id']]['children'][$key] = &$sub; } } unset($sub); // unset the reference to make sure to not overwrite it later... // now remove the entries with parents foreach ($array as $key => $sub) { if (isset($sub['parent_id'])) unset($array[$key]); } return $array; } function &find_by_key($key, $array) { foreach($array as $k => &$v) { if($key == $k) { return $v; } } foreach($array as $sub) { if(isset($sub['children']) && FALSE !== ($found = &find_by_key($key, $sub['children']))) { return $found; } } return FALSE; } function v2($array) { $out = array(); foreach ($array as $key => $sub) { if(!isset($sub['parent_id'])) { $out[$key] = $sub; $out[$key]['children'] = array(); } else { $parent = &find_by_key($sub['parent_id'], $out); $parent['children'] = array(); $parent['children'][$key] = $sub; } } return $out; } //var_dump(v1($array)); var_dump(v2($array));
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Notice: Only variable references should be returned by reference in /in/jtEQo on line 59 Notice: Only variable references should be returned by reference in /in/jtEQo on line 59 Deprecated: Automatic conversion of false to array is deprecated in /in/jtEQo on line 71 array(2) { [55]=> array(3) { ["ident"]=> string(6) "test 1" ["depth"]=> int(1) ["children"]=> array(0) { } } [25]=> array(3) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) ["children"]=> array(0) { } } }
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 Notice: Only variable references should be returned by reference in /in/jtEQo on line 59 Notice: Only variable references should be returned by reference in /in/jtEQo on line 59 Deprecated: Automatic conversion of false to array is deprecated in /in/jtEQo on line 71 array(2) { [55]=> array(3) { ["ident"]=> string(6) "test 1" ["depth"]=> int(1) ["children"]=> array(0) { } } [25]=> array(3) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) ["children"]=> array(0) { } } }
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Notice: Only variable references should be returned by reference in /in/jtEQo on line 59 Notice: Only variable references should be returned by reference in /in/jtEQo on line 59 array(2) { [55]=> array(3) { ["ident"]=> string(6) "test 1" ["depth"]=> int(1) ["children"]=> array(0) { } } [25]=> array(3) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) ["children"]=> array(0) { } } }
Output for 7.3.32 - 7.3.33
array(2) { [55]=> array(3) { ["ident"]=> string(6) "test 1" ["depth"]=> int(1) ["children"]=> array(0) { } } [25]=> array(3) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) ["children"]=> array(0) { } } }
Output for 5.0.0 - 5.0.5
Strict Standards: Only variable references should be returned by reference in /in/jtEQo on line 59 Strict Standards: Only variable references should be returned by reference in /in/jtEQo on line 59 array(2) { [55]=> array(3) { ["ident"]=> string(6) "test 1" ["depth"]=> int(1) ["children"]=> array(0) { } } [25]=> array(3) { ["ident"]=> string(6) "test 5" ["depth"]=> int(1) ["children"]=> array(0) { } } }
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/jtEQo on line 30
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/jtEQo on line 30
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/jtEQo on line 30
Process exited with code 255.
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