PHP - Echo value in associative array

Question

I feel like I am losing my mind.

<?php
print_r($roc_option);
?>

prints out this:

Array ( ['class'] => classnew1 ['id'] => idnew1 )

but then, on the next line,

<?php
echo $roc_option['class'];
?>

prints out NOTHING.

Any ideas what is going on?

Context: This is happening inside a foreach loop. A similar construction outside the loop, echo $roc_options[0]['class']; provide similarly nothing.

EDIT

Complete context (lots of debugging crud added to keep me sane)

Code

echo "ln1 -- <br>";
   print_r(array_values( $roc_options ));

   echo "<br><br>ln2 -- <br>";
   print_r(array_values( $roc_options[0] ));

   echo "<br><br>ln3a -- <br>";
   echo $roc_options[0]['class']; 

   echo "<br><br>ln3b -- <br>";
   echo $roc_options[0][0]; 


   foreach ( $roc_options as $roc_option ){ 
    echo "<br>inside foreach <br>";

    echo "<br><br>ln4 -- <br>";
    print_r($roc_option);

    echo "<br><br>ln5 -- <br>";
    echo $roc_option[0];

output

ln1 -- Array ( [0] => Array ( ['class'] => classnew1 ['id'] => idnew1 ) )

ln2 -- Array ( [0] => classnew1 [1] => idnew1 )

ln3a --

ln3b --

inside foreach

ln4 -- Array ( ['class'] => classnew1 ['id'] => idnew1 )

ln5 --

I cannot understand why 3a, 3b, and 5 are all empty.

IT GOES ON AND ON

I switched to var_dumps and forced some new names in, just to make sure the form was saving properly...

CODE:

   var_dump($roc_options);
   echo "ln1 -- <br>";
   print_r(array_values( $roc_options ));

   echo "<br><br>ln2 -- <br>";
   print_r(array_values( $roc_options[0] ));

   echo "<br><br>ln3a -- <br>";
   var_dump( $roc_options[0]['class'] ); 

   echo "<br><br>ln3b -- <br>";
   var_dump( $roc_options[0][0]); 


   foreach ( $roc_options as $roc_option ){ 
    echo "<br>inside foreach <br>";

    echo "<br><br>ln4 -- <br>";
    print_r($roc_option);

    echo "<br><br>ln5 -- <br>";
    var_dump( $roc_option[0] );

    echo "<br><br>ln6 -- <br>";
    var_dump( $roc_option['class'] );

    echo "<br><br>ln7 -- <br>";
    var_dump( $roc_option["id"] );

output

array(1) { [0]=> array(2) { ["'class'"]=> string(9) "new class" ["'id'"]=> string(6) "new id" } } ln1 -- Array ( [0] => Array ( ['class'] => new class ['id'] => new id ) )

ln2 -- Array ( [0] => new class [1] => new id )

ln3a -- NULL

ln3b -- NULL inside foreach

ln4 -- Array ( ['class'] => new class ['id'] => new id )

ln5 -- NULL

ln6 -- NULL

ln6 -- NULL

Notice ln4 --- $roc_option is an array with two items. then look at 5-7 I can't get the value out with a numerical index or with a key name, whether in single or double quotes. (When I try without quotes at all, the page doesn't load.)

Also your print_r() outputs are missing things like commas and quotes etc and therefore make no sense. Do not edit the output, put it in your question EXACTLY as it appears without any sensorship — RiggsFolly
– RiggsFolly, Commented Nov 7, 2015 at 12:21
That is EXACTLY how it is outputting. (It may matter that this is inside a WordPress admin page, but I don't see how it should matter. --- I am aware that the output makes no sense. That's why I'm so confused. — Adam Michael Wood
– Adam Michael Wood, Commented Nov 7, 2015 at 12:22
Could you do a var_dump($roc_options); before ln1 and edit the results into the answer? Should prove enlightening. — user5051310
– user5051310, Commented Nov 7, 2015 at 12:49

Alex Andrei · Accepted Answer · 2015-11-07 12:58:11Z

1

EDIT:
See difference between $array['class'] and $array["'class'"]

foreach ( $options as $optionArray ){ 
    var_dump($optionArray['class']); // notice undefined index
    var_dump($optionArray["'class'"]); // string(9) "classnew1"
}

You need to make the difference between the output of array_values and what print_r gives out.

Assuming the following structure, based on your output, see the following logic:

$options = array(
    array(
        'class' => 'classnew1',
        'id'    => 'idnew1'
    )
);

print_r($options);

print_r(array_values($options));

print_r(array_values( $options[0] ));

foreach ( $options[0] as $option ){ 
    print $option . PHP_EOL;
}

that would print out your inner values.

If you want to extend the loop and not rely on the first index, try this

foreach ( $options as $optionArray ){ 
    print $optionArray['class'] . '-' . $optionArray['id']. PHP_EOL;
}

Or if you'd like to print out a single value, you could do this

print $options[0]['id'];

edited Nov 7, 2015 at 12:58

answered Nov 7, 2015 at 12:31

Alex Andrei

7,2763 gold badges30 silver badges44 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Adam Michael Wood Over a year ago

I know how it should work. Look at the most recent update, though. I just cannot access the values in $roc_option for some reason.

Alex Andrei Over a year ago

you have single quotes in your array indexes, I will edit my answer to illustrate. Should have seen it sooner, apologies :)

Adam Michael Wood Over a year ago

oh... wow - those should definitely not be there. I need to go look at my form inputs.

Alex Andrei Over a year ago

yeah, they are clearly shown in the output of print_r but .. missed them somehow

Collectives™ on Stack Overflow

PHP - Echo value in associative array

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related