PHP Arrays, referencing an earlier value in same array

Question

Hi I'm trying to do this

$system = array(
'key1'  => 'val1',
'key2'  => 'val2',
'key3'  => $system['key1'].'val3'
);

But when we echo key3 it ends up as just "val3" rather than "val1val3".

Is there a way around this problem?

Thanks!

$system is not an array at the moment you ask for index key1. The parameters are processed before the assignment operator here. — Virus721
– Virus721, Commented Jul 24, 2013 at 15:34
@Virus721 it might be an array, it might be some other type, it might be non-existent .. we can't say from the given snippet ... ;-) — johannes
– johannes, Commented Jul 24, 2013 at 15:35
$system is not an array - or has not index key1 - at the moment you ask for index key1 — Virus721
– Virus721, Commented Jul 24, 2013 at 15:43

Jason McCreary · Accepted Answer · 2013-07-24 15:31:20Z

4

Is there a way around this problem?

You can assign it after you declare $system/key1:

$system = array('key1' => 'val1', 'key2' => 'val2');
$system['key3'] = $system['key1'] . 'val3';

answered Jul 24, 2013 at 15:31

Jason McCreary

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