Variable variables syntax and for loop issues

Question

I'm using variables as keys in an array. I understand that won't work with the superglobals. The following code snippet will run the correct number of times, but only picks up data on the first iteration. Do I have a variable variable syntax problem, or a loop problem? Can anyone clarify this for a newbie?

$php_postData = $_POST; 

$php_totalPanels = $_SESSION['totalPanels']; 

for ($php_count=1;$php_count<$php_totalPanels; $php_count++){
echo "<div class='individualQuote'>";

$php_currentItemWidth = 'width_' . $php_count; 
$php_currentItemHeight = 'height_' . $php_count;        
$php_currentItemDescription = 'description_' . $php_count;
$php_currentItemPartNumber = 'partNumber_' . $php_count;
$php_currentItemLexan = 'lexan_' . $php_count;
$php_currentItemVinyl = 'vinyl_' . $php_count;
$php_currentItemPolyester = 'polyester_' . $php_count;

if ( isset($php_postData[$php_currentItemDescription]) ){
echo "<p><span class='em'>Label Name: </span>" . $php_postData[$php_currentItemDescription] . "</p>";   
}

if ( isset($php_postData[$php_currentItemPartNumber]) ){
echo "<p><span class='em'>Part Number: </span>" . $php_postData[$php_currentItemPartNumber] . "</p>";   
}


if ( isset($php_postData[$php_currentItemLexan]) && $php_postData[$php_currentItemLexan] != '0' ) {
echo "<p><span class='em'>Material: </span>" . $php_postData[$php_currentItemLexan] . "</p>";
} 

if ( isset($php_postData[$php_currentItemVinyl]) && $php_postData[$php_currentItemVinyl] != '0'){
echo "<p><span class='em'>Material: </span>" . $php_postData[$php_currentItemVinyl] . "</p>";
} 

if ( isset($php_postData[$php_currentItemPolyester]) && $php_postData[$php_currentItemPolyester] != '0'){
echo "<p><span class='em'>Material: </span>" . $php_postData[$php_currentItemPolyester] . "</p>";
}

if ( isset($php_postData[$php_currentItemWidth]) && isset($php_postData[$php_currentItemHeight]) ){
echo "<p><span class='em'>Size: </span>" . $php_postData[$php_currentItemWidth] . " x " . $php_postData[$php_currentItemHeight] . "</p>";
 }  

echo "</div>";
}

"that won't work with the superglobals". What won't work with superglobals? Can you edit in the code you are using? — gen_Eric
– gen_Eric, Commented Mar 12, 2014 at 15:14
first thing first add session_start() at the top of ur page !! — Abhik Chakraborty
– Abhik Chakraborty, Commented Mar 12, 2014 at 15:17
So, what's the problem here? You're not using "variable variables". Using "variables as keys" works just fine with superglobals. Where did you get the idea that it didn't? Chances are, you just need to add session_start() so that $_SESSION will be available. — gen_Eric
– gen_Eric, Commented Mar 12, 2014 at 15:21
@user1681975: $_POST[$something] works just fine. You've misunderstood that page. It's about "variable variables". You are not using that here. Variable variables is when you do this: $myVar = 6; $varName = 'myVar'; echo $$varName;. Notice the $$. That's a variable variable. What you are doing here is just accessing an array key with a variable, it's completely different. — gen_Eric
– gen_Eric, Commented Mar 12, 2014 at 15:30

benfes · Accepted Answer · 2014-03-12 15:34:27Z

1

Could you possibly give an example of the data you are posting in?

Looking at the code your loop starts at 1 and continues while it is lower than the totalPanels value. If you are only posting in an array that is has a 2 sets of data then only one will get printed out. Perhaps your loop should run until the count is lower-than-or-equal-to the totalPanels E.g:

for ($php_count=1;$php_count<=$php_totalPanels; $php_count++){...}

Or perhaps you mean to have the loop count start at zero E.g.:

for ($php_count=0;$php_count<$php_totalPanels; $php_count++){...}

I think either of these should make your code run on all values being posted in.

answered Mar 12, 2014 at 15:34

benfes

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1 Comment

user1681975 Over a year ago

I've tried this. It changes the number of times the loop runs, but doesn't help with picking up the missing data. As written, the loop starts and stops where I need it to.

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