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<?php $array = [ ['ref' => 'Q1'], ['ref' => 'C6'], ['ref' => 'C13'], ['ref' => 'S3'], ['ref' => 'Q11'], 8 => ['ref' => 'S7'], 9 => ['ref' => 'C4'], ]; $map = array_flip( ['S', 'Q', 'D', 'C', 'P', 'E'] ); foreach ($array as $keys[] => ['ref' => $v]) { sscanf($v, '%1s%d', $letter, $integers[]); $priorities[] = $map[$letter]; } array_multisort( $priorities, $integers, $array ); var_export(array_combine($keys, $array));
Output for 8.1.32, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1
array ( 0 => array ( 'ref' => 'S3', ), 1 => array ( 'ref' => 'S7', ), 2 => array ( 'ref' => 'Q1', ), 3 => array ( 'ref' => 'Q11', ), 4 => array ( 'ref' => 'C4', ), 8 => array ( 'ref' => 'C6', ), 9 => array ( 'ref' => 'C13', ), )
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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