php an array of reference

Question

I have two arrays. one will be added with arrays as children, another one keeps references to the array being added to the first one.

$list=array();
$stack=array();

in a for loop:

$list[]=array('something');
$stack[]=& end($list); //errors: Only variables should be assigned by reference

what am i doing wrong here? thanks for help.

The error message seems pretty self-explanatory. And why the new Array? Just Array will do. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Jul 9, 2011 at 18:16

dynamic · Accepted Answer · 2011-07-10 16:48:22Z

1

Edited

$stack[] = &$list[count($list)-1];  //> Assuming numeric index incremental

or

end($list);
$stack[] = &$list[key($list)];

edited Jul 10, 2011 at 16:48

answered Jul 9, 2011 at 18:13

dynamic

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8 Comments

bingjie2680 Over a year ago

this way, the reference is to $var, not to end($list) ?? right?? I want the reference to the end($list), so it will not disppare outside the for loop.

user149341 Over a year ago

&= means something different. Probably not what's intended.

Gedrox Over a year ago

Still it won't be a reference to the last element of $list but to the new variable $var.

rzetterberg Over a year ago

@Gedrox Taken from the documentation: "The same syntax can be used with functions that return references, and with the new operator".

Gedrox Over a year ago

The problem is that in the first line the reference is lost. The function "end" returns the copy of the last element from the array.

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Gedrox · Accepted Answer · 2011-07-09 18:19:05Z

0

Objects will be always passed by reference in PHP 5.

EDITED

But if array is not a class then

$element = array();
$list[] = &$element;
$stack[] = &$element;

answered Jul 9, 2011 at 18:19

Gedrox

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3 Comments

bingjie2680 Over a year ago

sorry, I am a beginner in php. so does the same to arrays??

Gedrox Over a year ago

The code is ment if you work with PHP arrays. Of course you need to pass filled array into the $element.

bingjie2680 Over a year ago

so both list and stack are arrays of reference to $element??

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