PHP - Multidimensional array to CSV

Question

I currently have coded a way to turn a multidimensional array to comma separated values (I\'m using pipes instead of commas for ease of debugging). The problem is, I know th

Answer 1

Not sure if this will help you, but would it not be easier to flatten the array first and then format in in the way you want? To flatten the array try this:

$array = "YOUR ARRAY";

$FlatArray = array();

foreach(new RecursiveIteratorIterator(new RecursiveArrayIterator($array)) as $k=>$v)
  {
    $FlatArray[$k] = $v;
  }

Been trying all morning to come up with a recursive function for this. This is as close as I got, Maybe you can improve upon this.

$data = array('name' =>array('singular' => NULL,'plural' => NULL,'fields' =>array('price' =>array('label' =>'Preis','company_id' =>array('label' => NULL,'placeholder' => NULL)))));


function arr_to_csv($data,$csv = '||')
{
$list = "";
foreach($data as $key => &$value)
        {
        $list .= $key . $csv .((!is_array($value))?(is_null($value)?'null':$value): arr_to_csv($value))."<br>";
        }
return $list;
}   



print_r(arr_to_csv($data));

Returns This:

name||singular||null

plural||null

fields||price||label||Preis

company_id||label||null

placeholder||null

Answer 2

I didn't check it, so in case it doesn't work it should be corrected.

function readarray($from_array, $addr = array()) {
    global $output;
    foreach ($from_array as $key => $value) {
        if (is_Array($value) && count($value) > 0) {
            $addr[] = $key;
            readarray($value, $addr);
        } else {
            $output[] = implode('||', $addr) . $value;
        }
    }

}


$output = array();
foreach ($my_array as $key=>$value){
readarray($value); 
}

// improved to get separate arrays of the root of initial array

Answer 3

This is some pseudocode, but it is a start:

$strings = [];
$flattenArray = function($arr, $level) use (&$strings, &$flattenArray) {

    foreach($arr as $key=>$value){
        $s = &$strings[$level];
        if(!isset($s)) { $s = array(); }
        $s[] = $key;
        if(is_array($value)) {
           $flattenArray($value, $level);
        }
        else {
           $s[] = $value;
        }
        $level ++;
    }
};
$flattenArray($myArray, 0);
foreach($strings as &$arr) {
     $arr = implode("||", $arr);
}

Small demo with your array: http://codepad.viper-7.com/CR2SPY <-- It does not work fully, but it is a start

---

Update:

Here is a demo that I think works the way you want: http://codepad.viper-7.com/shN4pH

Code:

$strings = [];
$flattenArray = function($arr, $level, $k = null) use (&$strings, &$flattenArray) {

    foreach($arr as $key=>$value){
        if($k === null) {
            $s = &$strings[$key];
        }
        else {
            $s = &$strings[$k];
        }
        if(!isset($s)) { 
            $s = array();  
        }
        $str = &$s[$level];
        if(!isset($str)) { 
            $str = array(); 
            
            if($k !== null) { $str[] = $k; }
        }
        $str[] = $key;
        if(is_array($value)) {
           $flattenArray($value, $level, ($k === null) ? $key : $k);
        }
        else {
            $str[] = is_null($value) ? "null" : $value;
        }
        $level ++;
    }
};
$flattenArray($myArray, 0);
$all = [];
foreach($strings as $k => $arr){
    $new = array();
    foreach($arr as $ky => $ar) {
        $all[] = implode("||", $ar);
    }
}

print_r($all);