Online PHP editor | output for LkgLv

@ 2020-04-29T01:21:54Z

<?php

$arr = [
    [
        'group_id' => 5,
        'group_title' => 'Test group',
        'group_parent_id' => 2
    ],
    [
        'group_id' => 6,
        'group_title' => 'Second-level test group',
        'group_parent_id' => 5
    ],
    [
        'group_id' => 7,
        'group_title' => 'Third-level test group',
        'group_parent_id' => 6
    ],
    [
        'group_id' => 8,
        'group_title' => 'Other test group',
        'group_parent_id' => 1
    ],
    [
        'group_id' => 9,
        'group_title' => 'Second-level other test group',
        'group_parent_id' => 8
    ]
];

$output = array();
$group_ids = array();
foreach ($arr as $el) {
    $parent_id = $el['group_parent_id'];
    if (!isset($group_ids[$parent_id])) {
        // must be a top-level element
        $output[] = $el;
        // save a pointer
        $group_ids[$el['group_id']] = &$output[array_key_last($output)];
    }
    else {
        // already exists, $group_ids[$parent_id] points to the entry
        $parent = &$group_ids[$parent_id];
        if (!isset($parent['subgroups'])) {
            // no subgroups array, create one
            $parent['subgroups'] = array();
        }
        // add this entry to the subgroups
        $parent['subgroups'][] = $el;
        // save a pointer
        $group_ids[$el['group_id']] = &$parent['subgroups'][array_key_last($parent['subgroups'])];
    }
}
print_r($output);

Output for 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 ( [0] => Array ( [group_id] => 5 [group_title] => Test group [group_parent_id] => 2 [subgroups] => Array ( [0] => Array ( [group_id] => 6 [group_title] => Second-level test group [group_parent_id] => 5 [subgroups] => Array ( [0] => Array ( [group_id] => 7 [group_title] => Third-level test group [group_parent_id] => 6 ) ) ) ) ) [1] => Array ( [group_id] => 8 [group_title] => Other test group [group_parent_id] => 1 [subgroups] => Array ( [0] => Array ( [group_id] => 9 [group_title] => Second-level other test group [group_parent_id] => 8 ) ) ) )
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 7.2.0 - 7.2.33: Fatal error: Uncaught Error: Call to undefined function array_key_last() in /in/LkgLv:39 Stack trace: #0 {main} thrown in /in/LkgLv on line 39
Process exited with code 255.

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