[Solved] how to generate multidimensional array from array value

by


Try this:

<?php
function group($a, $level, $previous="") {
    $b = [];
    for( $i = 0, $n = count($a); $i < $n; ++$i ) {
        if( $level > 0 && $a[$i][$level-1] !== $previous  ) {
            continue;
        }
        $key = $a[$i][$level];
        $b[$key] = [];
        if( array_key_exists($level+1, $a[$i]) ) {
            $b[$key] = group($a, $level+1, $key);
        }
    }
    return $b;
}

print_r(group($a, 0));

Output:

Array(
    [college] => Array (
        [student] => Array (
            [contact] => Array ()
        )
        [parents] => Array (
            [contact] => Array ()
        )
    )
    [school] => Array (
        [student] => Array (
            [contact] => Array ()
        )
        [parents] => Array (
            [contact] => Array ()
        )
    )
)

Using @AlivetoDie example:

Array (
    [college] => Array (
        [student] => Array (
            [contact] => Array ()
        )
        [parents] => Array (
             [contact] => Array ()
        ) 
    ) 
    [school] => Array (
        [parents] => Array (
            [contact] => Array ()
        )
        [student] => Array (
             [contact] => Array ()
        ) 
        [data] => Array (
             [contact] => Array()
        )
    )
)

5

solved how to generate multidimensional array from array value