Online PHP editor | output for ZG6eX

@ 2018-07-16T13:26:15Z

<?php

$array = [
    
    'id_1_1' => 'id1',
    'foo_1_2' => 'value1_1',
    'bar_1_3' => 'value1_2',
    'more_1_4'  => 'value1_3',
    'id_2_1' => 'id2',
    'foo_2_2' => 'value2_1',
    'bar_2_3' => 'value2_2',
    'more_2_4' => 'value2_3'
];

function convert($a) {
    $map = [
    ];
    $result = [];
    foreach ($a as $array_key => $value) {
        list($newkey, $number) = explode('_', $array_key);
        if ($newkey === 'id') {
            $map[$number] = $value;
            $result[$value] = [];
        } elseif (key_exists($number, $map)) {
            $id = $map[$number];
            $result[$id][$newkey] = $value;
        }
    }
    return $result;
}
function deconvert($result)
{
    $array = [];
    $i = 1;
    foreach ($result as $id => $arr) {
        $array['id_'.$i.'_1'] = $id;
        $j = 1;
        foreach ($arr as $key => $value) {
            $array[$key . '_' . $i . '_' . $j] = $value;
            $j++;
        }
        $i++;
    }
    return $array;
}
    
$result = convert($array);
var_export($result);

$back = deconvert($result);
var_export($back);

Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: array ( 'id1' => array ( 'foo' => 'value1_1', 'bar' => 'value1_2', 'more' => 'value1_3', ), 'id2' => array ( 'foo' => 'value2_1', 'bar' => 'value2_2', 'more' => 'value2_3', ), )array ( 'id_1_1' => 'id1', 'foo_1_1' => 'value1_1', 'bar_1_2' => 'value1_2', 'more_1_3' => 'value1_3', 'id_2_1' => 'id2', 'foo_2_1' => 'value2_1', 'bar_2_2' => 'value2_2', 'more_2_3' => 'value2_3', )
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 ( 'id1' => array ( 'foo' => 'value1_1', 'bar' => 'value1_2', 'more' => 'value1_3', ), 'id2' => array ( 'foo' => 'value2_1', 'bar' => 'value2_2', 'more' => 'value2_3', ), )array ( 'id_1_1' => 'id1', 'foo_1_1' => 'value1_1', 'bar_1_2' => 'value1_2', 'more_1_3' => 'value1_3', 'id_2_1' => 'id2', 'foo_2_1' => 'value2_1', 'bar_2_2' => 'value2_2', 'more_2_3' => 'value2_3', )

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