How do I access a variable from an stdClass object within an Array of Arrays?

Question

I did a print_r on my array $total and it returned the following:

Array ( ) Array ( ) Array ( ) Array ( ) Array ( [0] => stdClass Object ( 
[generated] => 6 [magnitude] => 3 [log_pk] => 14 [result] => 0.5000 ) )
Array ( ) Array ( )

I need to be able to print out log_pk from within the stdClass Object. I have tried print $total[0]->log_pk but that was unsuccessful. The error was Undefined offset: 0. Any help is appreciated. Thanks.

What's with the Array ( ) Array ( ) Array ( ) Array ( ) Arr... at the beginning? — Dave Chen
– Dave Chen, Commented Aug 10, 2013 at 2:35
@DaveChen It looks like consecutive print_r on empty arrays. — Nabil Kadimi
– Nabil Kadimi, Commented Aug 10, 2013 at 2:38
This $total variable is the result of a MySQL query, each Array() I'm assuming represents a particular day as the query was based on the last 7 days. I also tried, $total[4][0]['log_pk] and there was no luck. — cheersjosh
– cheersjosh, Commented Aug 10, 2013 at 2:38
@PRPGFerret in which case he wouldn't get Undefined offset: 0 — Nabil Kadimi
– Nabil Kadimi, Commented Aug 10, 2013 at 2:39

Dave Chen · Accepted Answer · 2013-08-10 02:46:15Z

1

So this is within a loop, you should check if the index 0 exists first.

if (isset($total[0])) echo $total[0]->log_pk

answered Aug 10, 2013 at 2:46

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Dave Chen

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Matt Browne · Accepted Answer · 2013-08-10 02:39:28Z

1

Are you doing this within a loop? If so then it looks like the array is empty on most iterations. Try:

if (!empty($total)) print $total[0]->log_pk;

answered Aug 10, 2013 at 2:39

Matt Browne

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wesleywmd · Accepted Answer · 2013-08-10 02:39:00Z

0

var_dump() displays structured information about one or more expressions that includes its type and value. Arrays and objects are explored recursively with values indented to show structure.

var_dump($total)

PHP: var_dump - Manual

answered Aug 10, 2013 at 2:39

wesleywmd

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1 Comment

cheersjosh Over a year ago

I'm trying to get a particular value out of the $total array, not dump the whole lot?

Nabil Kadimi · Accepted Answer · 2013-08-10 02:43:22Z

0

it looks like your print_r is inside a loop.

while(true){
    $total = some_function();
    print_r($total);
    if($condition) break;
}
// Here - outside the loop, is not the right place for the print_r();

If you want you print outside the loop, you would change $total = some_function(); to $total[] = some_function(); and then you can do print_r($total[index])

answered Aug 10, 2013 at 2:43

Nabil Kadimi

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