Restarting a PHP Loop

Question

I have this piece of code

foreach($mnthArrPtrn as $m => $mn)
{   
    if(!isset($catName)) {
        $catVals = array();      
        $prevCat = $catName = $pntChrtQry[0]['CAT']['categoryname']; 
        $pntVals .= '{name:'.$catName.',data:[';
    }else if($prevCat != $catName) {
        $prevCat = $catName;
        $catVals = array(); 
        $pntVals .= '{name:'.$catName.',data:[';
    }     
    foreach($pntChrtQry as $key => $val){
        $catName = $val['CAT']['categoryname'];
        if($prevCat != $catName){
            continue 2;
        }
        echo '<br />$m::'.$m; 
        echo '<br />$mn::'.$mn;
        echo '<br />$val::'.$val[0]['MNTH'];
        if($m == $val[0]['MNTH'] || $mn == $val[0]['MNTH']){
            $catVals[] = $val[0]['total'];
        }
    }
    pr($catVals);
    if(!isset($catName)){
        $pntVals .= ']},';
    }
    $catName = $val['CAT']['categoryname'];
}

1st loop iterates over a months array which are joined as a key value pair. What I am doing here is on getting a new catName I continue the internal loop but at the same time I want to restart loop 1 with $prevCat,$catName still preserving their values. Is this possible? Sorry If this is a silly question.

I tried converting the first one to a while statement and use a reset then but It didn't help me.

a) give your variables, good names like $month, $months, $category, $values, etc. b) Break this up into multiple clear functions, this code drives one crazy to read. c) If you want to convert a PHP array to a JSON array, use the native functions for that. — markus
– markus, Commented Feb 3, 2013 at 11:54
If you need to restart a loop, use while in conjunction with each, with a reset to go back to the start of an array. You can't restart a foreach, no. — halfer
– halfer, Commented Feb 3, 2013 at 12:00
is that possible to do right above the continue statement?I want to restart the extrnl one — techie_28
– techie_28, Commented Feb 3, 2013 at 12:01
@techie_28 form the required array in PHP first, then use json_encode. (and keep working on improving your english, it will help you greatly!) — markus
– markus, Commented Feb 3, 2013 at 12:49

halfer · Accepted Answer · 2013-02-03 12:06:00Z

4

Something like this will allow you to arbitrarily restart a loop:

while (list($key, $value) = each($mnthArrPtrn)) {
    if ($needToRestart) {
        reset($mnthArrPtrn);
    }
}

See more here.

answered Feb 3, 2013 at 12:06

halfer

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7 Comments

techie_28 Over a year ago

I have a nested loop inside the external one..And on that continue I want to restart...will that work/

halfer Over a year ago

Yes, I think so. Swap the outer loop for the one I suggest, and reset the array before you do continue 2.

halfer Over a year ago

Perhaps your continue should be at the end of your inner loop? I don't know, since I don't know the algorithm, nor the purpose of the code.

techie_28 Over a year ago

That didnt helped too @halfer I tried the outer foreach to be while(list($m,$mn) = each($mnthArrPtrn))

halfer Over a year ago

Well, this is where you have to do some debugging. It's probably worth my pointing out that (in general) if you respond with "That didn't help too", there's not much I can say unless you can explain in detail how it didn't help. Otherwise I have to guess, which isn't very useful! :)

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