up vote -1 down vote favorite

PHP's list keyword is nice for taking out variables from an array $a as below

    $a = array(1,22);
    list($b, $c) = $a;
    var_dump("$a $b $c");

But for array $a2 in the form of key => value as below, I failed to use list

    $a2 = array('b'=>1,'c'=>22);
    list($b, $c) = $a2;
    list($bkey, $b, $ckey, $c) = $a2;
    list( list($bkey, $b), list($ckey,$c) ) = $a2;

    var_dump("$a2 $b $c");

All of the three above assignments fail. I give up.

If you know how to get the key & value in array $a2, please help!

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1  
Better suited as a comment: list() only works on numerical arrays and assumes the numerical indices start at 0. Reference – Josh Feb 25 '12 at 10:04

3 Answers

up vote 1 down vote accepted

Following the comment of Mr Evil below (Col Shrapnel, see his profile), I never said following two ways are different, one could use either but I have advised using these methods on user-inputted data could create security problems, use it on your own risk or if there is no user-inputted data.

It does not seem to work with associatieve arrays, you can do something like this though:

foreach ($array as $key => $value) {
     $$key = $value;
}

Example:

$a2 = array('b'=>1,'c'=>22);
foreach ($a2 as $key => $value) {
     $$key = $value;
}

echo $b . '<br>';
echo $c;

Result:

1
22

One could also use extract() function but I generally avoid it because using it on user-inputted values could create security hazards. Depending on your choice, you might want to use it or if data isn't coming from users side.

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2  
@Col.Shrapnel: Mind your language, you idiot, ignorant ! This person has always created problems for all here, see his profile what he says. He should be banned here. – Sarfraz Feb 25 '12 at 10:24
@Sarfraz, you worked only 1 year and become a senior engineer ? That's great. :-D – Mackintoast Feb 25 '12 at 10:27
@Mackintoast: Worked for one year ? I don't get it? – Sarfraz Feb 25 '12 at 10:28
@Col.Shrapnel: Do you ever see other people speaking like you? Even if one answers wrong, people don't behave like you do. This is the first time I spoke like that in a comment because it is too much now, we can't bear you any more. – Sarfraz Feb 25 '12 at 10:30
1  
To: Sarfraz Agree! @Shrapnel It is not a nonsense at all! – Nam G. VU Feb 25 '12 at 10:33
show 2 more comments
up vote 1 down vote

I think you should use each function.

each() Return the current key and value pair from an array and advance the array cursor.

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up vote 0 down vote

it seems it is extract() function you need

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You might want to add a link or explain the function to help others struggling with this issue. – Sgoettschkes Jul 22 '12 at 20:54

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