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run code in 150+ php & hhvm versions
Bugs & Features
<?php ini_set('display_errors', 1); error_reporting(E_ALL); $db_results = array( array('cat' => 1, 'id' => 1), array('cat' => 1, 'id' => 2), array('cat' => 2, 'id' => 3), array('cat' => 1, 'id' => 4) ); $category_map = []; foreach ( $db_results as $row ) { $category_map[ $row['cat'] ][ $row['id'] ] = $row; } print_r($category_map);
Output for 5.4.38 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [1] => Array ( [1] => Array ( [cat] => 1 [id] => 1 ) [2] => Array ( [cat] => 1 [id] => 2 ) [4] => Array ( [cat] => 1 [id] => 4 ) ) [2] => Array ( [3] => Array ( [cat] => 2 [id] => 3 ) ) )
Output for 5.4.0 - 5.4.37
Warning: ini_set() has been disabled for security reasons in /in/USTjS on line 3 Array ( [1] => Array ( [1] => Array ( [cat] => 1 [id] => 1 ) [2] => Array ( [cat] => 1 [id] => 2 ) [4] => Array ( [cat] => 1 [id] => 4 ) ) [2] => Array ( [3] => Array ( [cat] => 2 [id] => 3 ) ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/USTjS on line 13
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/USTjS on line 13
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/USTjS on line 13
Process exited with code 255.