Multidimensional Array (with some values not sub-arrays) to string?

Question

I am trying to turn a multidimensional array into a patterned string with this array_map function:

function array_to_string($array) {
    return implode("&",array_map(function($a){return implode("~",$a);},$array));
}
$arr = array("hello",array("blue","red"),array("one","three","twenty"),"random");
array_to_string($arr);

Between each array element "&" and between each sub-array element (if it is an array) "~"

Should Output: hello&blue~red&one~three~twenty&random

However this outputs: Warning: implode(): Invalid arguments passed (2) I tried changing the function within the array_map to detect whether the multi-array's value is_array but from my outputs, I don't think that is possible? So essentially, I guess the real question is how can I place a test on the array_map function to see whether or not it is_array

Nemoden · Accepted Answer · 2012-09-07 04:21:34Z

2

Since $a can be an array or a string, you should check it in your callback function:

function array_to_string($array) {
    return implode("&",
               array_map(function($a) {
                   return is_array($a) ? implode("~",$a) : $a;
               }, $array)
           );
}

answered Sep 7, 2012 at 4:21

Nemoden

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