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<?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 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.28, 5.4.0 - 5.4.27
Parse error: syntax error, unexpected ']', expecting ')' in /in/6NnJm on line 7
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected ']', expecting ')' in /in/6NnJm on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/6NnJm on line 7
Process exited with code 255.

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