Reshape multidimensional nested PHP array to another format

Question

I have a multidimensional nested array:

$arr = array(
    'name'      => 'Root Node',
    'children'  => array(
        array(
            'name'      => 'Node A',
            'children'  => array(
                array(
                    'name'      => 'Node A.1',
                    'children'  => array(
                        array(
                            'name'      => 'Node A.1.1',
                            'children'  => ''
                        ),
                    ),
                ),

                array(
                    'name'      => 'Node A.2',
                    'children'  => ''
                ),
            ),
        ),

        array(
            'name'      => 'Node B',
            'children'  => array(
                array(
                    'name'      => 'Node B.1',
                    'children'  => '',
                ),

                array(
                    'name'      => 'Node B.2',
                    'children'  => ''
                ),
            )
        ),

        array(
            'name'      => 'Node C',
            'children'  => ''
        )
    ),
);

Currently this array is upto 4 levels but we can't assume its depth level static to 4 as it may have N levels as well. My goal is to convert this array with individual row array per relation like:

$arr = array(
    array( 'Root Node', 'Nodel A', 'Node A.1', 'Node A.1.1' ),
    array( 'Root Node', 'Nodel A', 'Node A.2' ),
    array( 'Root Node', 'Nodel B', 'Node B.1' ),
    array( 'Root Node', 'Nodel B', 'Node B.2' ),
    array( 'Root Node', 'Nodel C' ),
);

I know a recursive function should do the trick but I can't figure it out as its not that easy I thought in start. Any help would be greatly appreciated!

use foreach to get in all elements. inside foreach put the values on the table — Rafael Shkembi
– Rafael Shkembi, Commented Aug 12, 2016 at 10:50
I have tried foreach and recursive functions to make it working but couldn't figure it out — Subodh Bansal
– Subodh Bansal, Commented Aug 12, 2016 at 11:18

Udesh Bansal · Accepted Answer · 2016-08-22 12:26:49Z

2

Use following code snippet. It should resolve your problem.

function makeTreeArr($arr){ 
    $mainarr = []; 
    $tmparr = []; 
    function iterateChildren(&$mainarr,&$tmparr,$node){ 
        $tmparr[] = $node['name']; 
        if(is_array($node['children'])){ 
            foreach($node['children'] as $child){ 
                iterateChildren($mainarr,$tmparr,$child) ;     
            } 
        }else{ 
            $mainarr[] = $tmparr; 
        } 
        array_pop($tmparr ); 
    } 
   iterateChildren($mainarr,$tmparr,$arr); 
   return $mainarr; 
} 
$newarr = makeTreeArr($arr);

answered Aug 22, 2016 at 12:26

Udesh Bansal

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1 Comment

Subodh Bansal Over a year ago

It works! Thanks a lot for your efforts.. However, I have shorten the function further down as:

function iterateChildren( $node, $mainarr, $tmparr ) {  	$tmparr[] = $node['name']; 	if( is_array( $node['children'] ) ) { 		foreach($node['children'] as $child){  			$mainarr = iterateChildren( $child, $mainarr, $tmparr ); 		} 	} else {      	$mainarr[] = $tmparr;  	} 	 	array_pop( $tmparr );  	return $mainarr; }

Rohan Khude · Accepted Answer · 2016-08-12 11:44:44Z

0

Follow below protocol to fetch the elements as specified by you.

$name0=$arr['name'];
$in1=$arr['children'];
foreach($in1 as $key=>$value)
{
echo $name0.", ";
echo $name1=$in1[$key]['name'].", ";
$in2=$arr['children'][$key]['children'];
    foreach($in2 as $k2=>$v2)
    {
        echo $name2=$in2[$k2]['name'].", ";
        $in3=$arr['children'][$key]['children'][$k2]['children'];
        foreach($in3 as $k3=>$v3)
        {
           echo  $name3=$in3[$k3]['name'].", ";
        }
    }
    echo "</br>";
}

Output :-

Root Node, Node A, Node A.1, Node A.1.1, Node A.2,

Root Node, Node B, Node B.1, Node B.2,

Root Node, Node C,

edited Aug 12, 2016 at 11:44

answered Aug 12, 2016 at 11:36

Rohan Khude

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3 Comments

Subodh Bansal Over a year ago

Thanks for giving it an attempt. Looking at the code snippet, it seems limited to three levels only where I need it to accept any number of levels.

Rohan Khude Over a year ago

This is 4 level as specified

Subodh Bansal Over a year ago

Doesn't matter either 3 or 4 levels till its static with the script. We can't repeat foreach till 100 times for 100 depth levels.

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