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<?php $abc = array( 'rec_1' => array('f_name'=>'Aron','m_i'=>'M'), 'rec_2' => array('f_name'=>'Abbey','m_i'=>'D'), 'rec_3' => array('f_name'=>'Alice','m_i'=>'P')); function build_sorter($key) { var_dump($a); var_dump($b); exit; return function ($a, $b) use ($key) { return strnatcmp($a[$key], $b[$key]); }; } usort($abc, build_sorter('f_name')); foreach ($abc as $item) { echo $item['f_name'] . ', ' . $item['m_i'] . "\n"; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: Undefined variable $a in /in/OA8IU on line 8 NULL Warning: Undefined variable $b in /in/OA8IU on line 9 NULL
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 Warning: Undefined variable $a in /in/OA8IU on line 8 NULL Warning: Undefined variable $b in /in/OA8IU on line 9 NULL
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 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
Notice: Undefined variable: a in /in/OA8IU on line 8 NULL Notice: Undefined variable: b in /in/OA8IU on line 9 NULL
Output for 7.3.32 - 7.3.33
NULL NULL
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/OA8IU on line 11
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/OA8IU on line 11
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/OA8IU on line 11
Process exited with code 255.

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