Using an multi-dimensional array value as index in PHP

Question

aside from doing the actual work of iterating through an associative array, pushing a value into a new array and setting that equal the array of remaining fields, is there an array function built into PHP that would do something like this?

if so, what is it?

i would be changing the following:

array(
    [0] => array(
        [created] => 12512512,
        [name] => something
    )
)

into something like this:

array(
    [12512512] => array(
        [created] => 12512512,
        [name] => something
    )
)

Not that I know of, no, but if your array elements are of the same consistent structure (ie an array having a key of created), then it's easy enough to write a simple function to do that. — user554546
– user554546, Commented Aug 9, 2012 at 7:33
@JackManey ah, thats what i suspected.. and it makes me kind of sad :) — Kristian
– Kristian, Commented Aug 9, 2012 at 7:35
This is similar to array_flip... but not quite, you will need to write a custom function to perform this. — Geoffrey
– Geoffrey, Commented Aug 9, 2012 at 7:35

Geoffrey · Accepted Answer · 2012-08-09 07:42:47Z

1

Flip the value and remove the old one in the same array... this should be fine provided the created value doesn't overwrite one of the existing entries, which I highly doubt since created seems to be a timestamp.

foreach($myArray as $index => $entry) {
    $myArray[$entry['created']] = $entry;
    unset($myArray[$index]);
}

Or you could keep both copies and use references to save on ram.

foreach($myArray as &$entry)
    $myArray[$entry['created']] =& $entry;

answered Aug 9, 2012 at 7:42

Geoffrey

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Comments

donald123 · Accepted Answer · 2012-08-09 07:36:17Z

1

i don't know what you realy want to do .... maybe this could you help

<?php
   $new = array();
   foreach($oldArr as $arr) {
        $new[$arr['created']] = $arr;

   }
   print_r($new);
?>

answered Aug 9, 2012 at 7:36

donald123

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1 Comment

Geoffrey Over a year ago

You could save some RAM by doing it all in the same array, and un-setting the old value, or if you need to keep both, set the value by reference =&

Martin · Accepted Answer · 2012-08-09 08:31:40Z

1

if first array is $a

foreach ($a as $v){
    $newarray[$v['created']] = $v;
}

edited Aug 9, 2012 at 8:31

answered Aug 9, 2012 at 7:36

Martin

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Comments

Er. Anurag Jain · Accepted Answer · 2012-08-09 07:49:57Z

-1

please try code given below

$arrs = array();
$arrs[0]['created'] = 1252;
$arrs[0]['name'] = 'A';

$narrs = array();
foreach($arrs AS $arr){
 $narrs[$arr['created']]['created'] = $arr['created'];
 $narrs[$arr['created']]['name'] = $arr['name'];
}

echo "<pre>";
print_r($narrs); echo "</pre>";

thanks

answered Aug 9, 2012 at 7:49

Er. Anurag Jain

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