CODEWITHSUNDEEP
phplaravelvariableslaravel-5
Jan Kožušník
Jan Kožušník

Reputation: 693

PHP edit variable value edits other variables value

I'm quite confused about this behavior in PHP and I'm not sure, how to solve it. I want to do this: I generate Object and use some methods to set its attributes. Then I want to "cache" the object, so I will store it into other variable and then I do something else with the object but it also affects cached object. Could you give me some advice, how to do this?

Here is code snippet:

$query = new Obj();
$this->item->generateItemsQuery($query);
$this->itemsQuery = $query; // here I "cache" the variable for next usage...

// here I edit the old variable $query
if ($this->getFilter('limit') !== null) {
    $query = $query->limit($this->getFilter('limit'));
}
if ($this->getFilter('page') !== null) {
    $offset = ($this->getFilter('page') - 1) * $this->getFilter('limit');
    $query = $query->offset($offset);
}

public function generateItemsQuery(&$query)
{
     // some other things like this: $query = $query->offset($offset);
}

In this example -> problem is, that when I apply method "limit" and "offset" on $query it also affect $this->itemsQuery

Could you provide me some solution?

Thank you very much

Upvotes: 1

Views: 41

Answers (1)

craig_h
craig_h

Reputation: 32714

You may want to take a look at:

http://php.net/manual/en/language.oop5.references.php

Specifically:

an object variable doesn't contain the object itself as value anymore. It only contains an object identifier which allows object accessors to find the actual object.

If you want to create a clone of the object you will need to do:

$this->itemsQuery = clone $query;

See: http://php.net/manual/en/language.oop5.cloning.php

Upvotes: 2

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