Read nested array dynamicly in php

Question

I need to read nested arrays without knowing how the array will look.

For example;

$data = array(
        'Data1_lvl1' => array(
                            'Data1_lvl2' => "value",
                            'Data2_lvl2' => array(
                                                'Data1_lvl3' => "value"
                                            )
                        ),
        'Data2_lvl1' => 'value'
    );

Needs to be formatted to strings like:

Data1_lvl1/Data1_lvl2/
Data1_lvl1/Data2_lvl2/Data1_lvl3/
Data2_lvl1/

But the array can be of any size with any number of nested arrays inside it.

You can use the built in array_walk_recursive function of PHP. refer php.net/manual/en/function.array-walk-recursive.php — Imdad
– Imdad, Commented May 22, 2012 at 13:50

gunnx · Accepted Answer · 2012-05-22 13:20:48Z

2

$data = array(
        'Data1_lvl1' => array(
                            'Data1_lvl2' => "value",
                            'Data2_lvl2' => array(
                                                'Data1_lvl3' => "value"
                                            )
                        ),
        'Data2_lvl1' => 'value'
    );


function printArray($array)
{
    foreach ($array as $key=>$value)
    {
       echo $key.'/';
       if (is_array($value))
       {
          printArray($value);           
       } else {    
        echo '<br>';
        }

    }

}


printArray($data);

answered May 22, 2012 at 13:20

gunnx

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Comments

lukas.pukenis · Accepted Answer · 2012-05-22 13:19:30Z

If you want to output only the name of array elements then this recursive function will do the trick.

Your data:

$data = array(
        'Data1_lvl1' => array(
                            'Data1_lvl2' => "value",
                            'Data2_lvl2' => array(
                                                'Data1_lvl3' => "value"
                                            )
                        ),
        'Data2_lvl1' => 'value'
    );

Function:

function array2str($array, $str) {
  foreach($array as $key => $val) {
    if (is_array($val) ) {
        $str .= $key . '/';
        array2str($val, $str);
    }
  }
  echo $str.'<br />';  
  return $str;
}

array2str($data);

As you can see the script does ECHO in itself with <br /> to break the line when viewing results in a browser.

enoyhs · Accepted Answer · 2012-05-22 13:19:07Z

One way would to walk recursively through array with function similar to this:

<?php
function f($d, $str = '') {
        foreach ($d as $key => $val) {
                if (is_array($val)) f($val, $str . '/' . $key); // If this element is array parse next level
                else print_r($str . '/' . $key . '/'); // Output current string or do what you need to do with it..
        }
}

$data = array(
        'Data1_lvl1' => array(
                            'Data1_lvl2' => "value",
                            'Data2_lvl2' => array(
                                                'Data1_lvl3' => "value"
                                            )
                        ),
        'Data2_lvl1' => 'value'
);

f($data);

BenMorel · Accepted Answer · 2013-12-06 15:50:29Z

0

with that function:

<?php
function print_tree ($data, $prefix = '', &$index = 1) {
  foreach($data as $key => $datum) {
    echo $index++ . '. ' . ($new_prefix =  $prefix . $key . '/') . PHP_EOL;
    if (is_array($datum)) {
      print_tree ($datum, $new_prefix, $index);
    }
  }
}

I get

Data1_lvl1/

Data1_lvl1/Data1_lvl2/

Data1_lvl1/Data2_lvl2/

Data1_lvl1/Data2_lvl2/Data1_lvl3/

Data2_lvl1/

edited Dec 6, 2013 at 15:50

BenMorel

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answered May 22, 2012 at 13:32

Floréal Toumikian

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