basic question about php multiple FOREACH loops

I have few FOREACH loops in php;

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$c1 = 1;
$c2 = 1;
$c3 = 1;

foreach ($someArray as $a){
    echo $a;
    if (sizeof($someArray != $c1){
        echo " / ";
    }
    $c1++;
}

foreach ($otherArray as $b){
    echo $b;
    if (sizeof($otherArray != $c2){
        echo ", ";
    }
    $c2++;
}

// etc.

This seems somehow stupid, of course =) Is there any way to avoid declaring variables with same values and to use them in many FOREACH loops? Thanks in advance for any help!

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It appears you are trying to do what the following code does much better:

$line = implode(' / ', $someArray);
echo $line;

$line = implode(', ', $otherArray);
echo $line;