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<?php // array of characters depending on other characters $characters = array( 'a' => array('c'), 'b' => array('c', 'a'), 'd' => array('c', 'a'), 'c' => array(), 'l' => array('c'), 'f' => array('l'), 't' => array('a'), 'w' => array('c', 'a'), ); function sortCharacters($characters) { uksort ($characters, function ($a, $b) use ($characters) { if (empty($characters[$a]) && empty($characters[$b])) { // equal (no dependencies) return 0; } if (empty($characters[$a]) && !empty($characters[$b])) { // a has no dependencies so is lower return -1; } if (!empty($characters[$a]) && empty($characters[$b])) { // b has no dependencies so a is higher return 1; } if (in_array($a, $characters[$b])) { // b depends on a so a is lower return -1; } if (in_array($b, $characters[$a])) { // a depends on b so a is higher return 1; } return 0; }); return $characters; } $characters = sortCharacters($characters); print_r($characters);
Output for 7.0.0 - 7.0.25, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
Array ( [c] => Array ( ) [a] => Array ( [0] => c ) [b] => Array ( [0] => c [1] => a ) [d] => Array ( [0] => c [1] => a ) [l] => Array ( [0] => c ) [f] => Array ( [0] => l ) [t] => Array ( [0] => a ) [w] => Array ( [0] => c [1] => a ) )
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.
Output for 5.3.7 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30
Array ( [c] => Array ( ) [t] => Array ( [0] => a ) [w] => Array ( [0] => c [1] => a ) [b] => Array ( [0] => c [1] => a ) [l] => Array ( [0] => c ) [f] => Array ( [0] => l ) [a] => Array ( [0] => c ) [d] => Array ( [0] => c [1] => a ) )
Output for 5.3.6
Array ( [c] => Array *RECURSION* [t] => Array *RECURSION* [w] => Array *RECURSION* [b] => Array *RECURSION* [l] => Array *RECURSION* [f] => Array *RECURSION* [a] => Array *RECURSION* [d] => Array *RECURSION* )
Process exited with code 139.
Output for 5.3.0 - 5.3.5
Array ( [a] => Array ( [0] => c ) [b] => Array ( [0] => c [1] => a ) [d] => Array ( [0] => c [1] => a ) [c] => Array ( ) [l] => Array ( [0] => c ) [f] => Array ( [0] => l ) [t] => Array ( [0] => a ) [w] => Array ( [0] => c [1] => a ) )
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/Lfq4C on line 17
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/Lfq4C on line 17
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Lfq4C on line 17
Process exited with code 255.
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