Multidimensional Array to String

Question

I am trying to convert a multidimensional array into a string with a particular format.

function convert_multi_array($array) {
    foreach($array as $value)          


        

Answer 1

Here is a simple answer:

    function implode_recur ($separator, $arrayvar){
        $output = "";
         foreach ($arrayvar as $av)
         {
             if (is_array ($av))
             {
                $output .= implode_r ($separator, $av);
             }
            else
            {
                $output .= $separator.$av;
            }
            return $output;
         }
    }
    $result = implode_recur(">>",$variable);

Okay happy coding!

Answer 2

Look at my version. It implodes any dimension:

function implode_all($glue, $arr){            
    for ($i=0; $i<count($arr); $i++) {
        if (@is_array($arr[$i])) 
            $arr[$i] = implode_all ($glue, $arr[$i]);
    }            
    return implode($glue, $arr);
}

Here is the example:

echo implode_all(',', 
array(
1,
2,
array('31','32'),
array('4'),
array(
  array(511,512), 
  array(521,522,523,524),
  53))
);

Will print:

1,2,31,32,4,511,512,521,522,523,524,53

Answer 3

May be of no interest, but i needed to report a nested array which contained errors, so i simply defined an variable and then with json_encode put this in my email. One way of converting a array to a string.

Answer 4

You can use this one line array to string code:

$output = implode(", ",array_map(function($a) { return '<a href="'.$a['slug'].'">'.$a['name'].'</a>'; }, $your_array) );

print_r($output);

Output:

Link1, Link2, Link3

Answer 5

You are overwriting $array, which contains the original array. But in a foreach a copy of $array is being worked on, so you are basically just assigning a new variable.

What you should do is iterate through the child arrays and "convert" them to strings, then implode the result.

function convert_multi_array($array) {
  $out = implode("&",array_map(function($a) {return implode("~",$a);},$array));
  print_r($out);
}

Answer 6

You also can just take the original implementation from the PHP join manual (http://php.net/manual/en/function.join.php)

function joinr($join, $value, $lvl=0)
{
    if (!is_array($join)) return joinr(array($join), $value, $lvl);
    $res = array();
    if (is_array($value)&&sizeof($value)&&is_array(current($value))) { // Is value are array of sub-arrays?
        foreach($value as $val)
            $res[] = joinr($join, $val, $lvl+1);
    }
    elseif(is_array($value)) {
        $res = $value;
    }
    else $res[] = $value;
    return join(isset($join[$lvl])?$join[$lvl]:"", $res);
}

$arr = array(array("blue", "red", "green"), array("one", "three", "twenty"));
joinr(array("&", "~"), $arr);

This is recursive, so you even can do

$arr = array(array("a", "b"), array(array("c", "d"), array("e", "f")), "g");
joinr(array("/", "-", "+"), $arr);

and you'll get

a-b/c+d-e+f/g