Online PHP editor | output for V3n4E

@ 2018-05-05T05:53:40Z

<?php
$myarray = [
    [0, 70, 19, 0],
    [0, 24, 14],        // note missing 4th element
    [0, 15, 11, 0],
    [0, 15, 27, 0]
];

for ($i = sizeof($myarray)-2; $i>=0; --$i) {                   // start from 2nd last subarray, and move toward the start
    $max = max(sizeof($myarray[$i]), sizeof($myarray[$i+1]));  // make sure all elements are accounted for
    for($k = 0; $k < $max; ++$k) {                             // iterate and perform subtractions / declarations
        $myarray[$i][$k] = (isset($myarray[$i][$k]) ? $myarray[$i][$k] : 0) - (isset($myarray[$i+1][$k]) ? $myarray[$i+1][$k] : 0);                                                // declare/overwrite new values as encountered
    }
}

var_export($myarray);

Output for 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: array ( 0 => array ( 0 => 0, 1 => 46, 2 => -11, 3 => 0, ), 1 => array ( 0 => 0, 1 => 24, 2 => 30, 3 => 0, ), 2 => array ( 0 => 0, 1 => 0, 2 => -16, 3 => 0, ), 3 => array ( 0 => 0, 1 => 15, 2 => 27, 3 => 0, ), )
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 array ( 0 => array ( 0 => 0, 1 => 46, 2 => -11, 3 => 0, ), 1 => array ( 0 => 0, 1 => 24, 2 => 30, 3 => 0, ), 2 => array ( 0 => 0, 1 => 0, 2 => -16, 3 => 0, ), 3 => array ( 0 => 0, 1 => 15, 2 => 27, 3 => 0, ), )

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