using foreach with a multi-dimensional array

Question

I currently construct a multi-dim array from my input. like so: (example)

<form method=post action="testing.php">
<input name="response[0]['id']" type="hidden" value="<? echo $q1; ?>">
<input name="response[0]['answer']" type=text value=''>
<input name="response[1]['id']" type="hidden" value="<? echo $q2; ?>">
<input name="response[1]['answer']" type=text value=''>
<input name="response[2]['id']" type="hidden" value="<? echo $q3; ?>">
<input name="response[2]['answer']" type=text value=''>
<input name="response[3]['id']" type="hidden" value="<? echo $q4; ?>">
<input name="response[3]['answer']" type=text value=''>
<input type="submit" value="submit">
</form>

so that is successfully be POSTED. However I am trying to use a foreach to print out the values and I am getting it wrong.

EDIT my output array:

Array ( 
[0] => Array 
( 
['id'] => q1 
['answer'] => 1 
) 
[1] => Array 
( 
['id'] => q2 
['answer'] => 2 
) 
[2] => Array 
( 
['id'] => q3 
['answer'] => 3 
) 
[3] => Array 
( 
['id'] => q4 
['answer'] => 4 
)
)

can somebody explain how i would extract the values with a foreach or even a better way?

many thanks

KingCrunch · Accepted Answer · 2011-05-09 10:57:13Z

3

foreach ($_POST['response'] as $response) {
  echo $response['id'];
  echo $response['answer'];
}

This should do it.

answered May 9, 2011 at 10:57

KingCrunch

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4 Comments

dapperwaterbuffalo Over a year ago

ive already set $response as $_POST['response'] before the foreach.

KingCrunch Over a year ago

No problem, its up to you, how you name your variables :)

KingCrunch Over a year ago

Dont know, what you have tried exactly, but if you name your array $response you must use another name for the iterator variable, for examle $entry: foreach($response as $entry) { echo $entry['id']; echo $response['answer']; }

dapperwaterbuffalo Over a year ago

i simply implemented your example (so directly using the $_POST array) no luck.

jensgram · Accepted Answer · 2011-05-09 11:18:18Z

0

EDIT
Note the apos (') are part of the name! Either change the HTML (response[0][id]) or do the following.

The incoming array should look like:

$response = array(
    0 => array("'id'" => ..., "'answer'" => ...),
    1 => array("'id'" => ..., "'answer'" => ...),
    2 => array("'id'" => ..., "'answer'" => ...),
    3 => array("'id'" => ..., "'answer'" => ...),
);

Thus,

foreach ($response as $resp) {
    print 'ID=' . $resp["'id'"] . ', answer=' . $resp["'answer'"];
}

The problem: <input name="response[0]['answer']" /> will yield an array with 'answer' as key. I.e., the literal string with apos, not just answer. You should probably change the HTML to <input name="response[0][answer]" /> to avoid confusion. ~~I will try and see if this is documented behavior.~~ This behavior is indicated in the docs.

edited May 9, 2011 at 11:18

answered May 9, 2011 at 10:57

jensgram

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3 Comments

dapperwaterbuffalo Over a year ago

this is essentially what I tried and am getting no values out just the text.

jensgram Over a year ago

@buymypies What does a var_dump() on $_POST (or $_POST['response']) give?

jensgram Over a year ago

@buymypies You're very welcome. This was actually not just a look-in-the-manual question (which I first expected) :) Happy hacking.

Atticus · Accepted Answer · 2011-05-09 11:03:56Z

0

is this what you're trying to do?

<?php foreach($response as $entry): ?>
    <input name="<?php echo $entry['id']; ?>" />
    <input name="<?php echo $entry['answer']; ?>" />
<?php endforeach; ?>

and ofcourse structure the inputs the way you would as above

edited May 9, 2011 at 11:03

answered May 9, 2011 at 10:56

Atticus

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5 Comments

dapperwaterbuffalo Over a year ago

each row has an id and an answer, So i want to get both for every row.

Tatu Ulmanen Over a year ago

I spotted three mistakes in this example: you're not getting the value from $_POST, you foreach as $entry but use $response inside the loop and you spelled $response wrong.. ;)

Atticus Over a year ago

im just going off the variables he's using.. who knows what framework he's using.. i dont use $_POST..

Atticus Over a year ago

also his question is about extracting values of a 2 dimensional array which i am properly addressing. there's no errors.

dapperwaterbuffalo Over a year ago

if you look at my edit you can see the print_r output of my array after posting.

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