Combine array data into one variable

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I have foreaching array:

$arr = array(2,3,4);
$copy = $arr;
foreach ($arr as $val) {
    echo $val;
    if (next($copy )) {
        echo ','; // Add comma for all elements instead of last
    }
}

and the result is:

2,3,4

How to create a variable with value is above result, so it will looks like $var = '2,3,4' ?

asked 2 mins ago

Seventh St

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Combine array data into one variable