How to loop through a multi-element JSON array in PHP?

Question

I'm trying to loop through an JSON array in PHP and fill a fpdf table

My constructed string is valid JSON and looks like this:

[
 {"ap":"j4","la":"02.02.2012","tr":"30 Tage","tra":"19.95EUR"}, 
 {"ap":"de","la":"27.09.2012","tr":"30 Tage","tra":"19.95EUR"},
 ...
 ]

Which I'm setting as

if($rvar_apps != ""){
    $activeAppsJson = json_decode( $rvar_apps ,true);
}

And then I'm trying this, which blanks the page:

if( $activeAppsJson ){
    for($activeAppsJson as $item) {
        $pdf->Cell(25,8,$item['ap'],1,0);
        $pdf->Cell(25,8,$item['la'],1,0);
        $pdf->Cell(25,8,$item['tr'],1,0);
        $pdf->Cell(35,8,$item['tra'],1,1);

    }
}

Having never worked with php before... I need some help!

Question :
What's wrong with my loop and variables assignment. The assigment seems to work, but the blank page doesn't tell me what's wrong in my loop...

THANKS!

Answer 1

It should be foreach instead of for

foreach($activeAppsJson as $item) {
        $pdf->Cell(25,8,$item['ap'],1,0);
        $pdf->Cell(25,8,$item['la'],1,0);
        $pdf->Cell(25,8,$item['tr'],1,0);
        $pdf->Cell(35,8,$item['tra'],1,1);

    }