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<?php $abc = array( 'rec_1' => array('fn'=>'Aron','ln'=>'Michaels'), 'rec_2' => array('fn'=>'Abbey','ln'=>'Drake'), 'rec_3' => array('fn'=>'Alice','ln'=>'Peterson')); function build_sorter($key) { return function ($a, $b) use ($key) { return strcmp($a[$key], $b[$key]); }; } usort($abc, build_sorter('ln')); foreach ($abc as $item) { echo $item['f_name'] . ', ' . $item['m_i'] . "\n"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined array key "f_name" in /in/uIQAu on line 16 Warning: Undefined array key "m_i" in /in/uIQAu on line 16 , Warning: Undefined array key "f_name" in /in/uIQAu on line 16 Warning: Undefined array key "m_i" in /in/uIQAu on line 16 , Warning: Undefined array key "f_name" in /in/uIQAu on line 16 Warning: Undefined array key "m_i" in /in/uIQAu on line 16 ,
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined index: f_name in /in/uIQAu on line 16 Notice: Undefined index: m_i in /in/uIQAu on line 16 , Notice: Undefined index: f_name in /in/uIQAu on line 16 Notice: Undefined index: m_i in /in/uIQAu on line 16 , Notice: Undefined index: f_name in /in/uIQAu on line 16 Notice: Undefined index: m_i in /in/uIQAu on line 16 ,
Output for 7.3.32 - 7.3.33
, , ,
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/uIQAu on line 8
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 T_FUNCTION in /in/uIQAu on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/uIQAu on line 8
Process exited with code 255.

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