CODEWITHSUNDEEP
phparrayspathinitializationself-reference
NaN
NaN

Reputation: 3591

PHP possible to initial array with value from same array?

I want to save current path information in an Array and one field is a part of another. Can I access a field of the same array during initialization?

$this->path = array
(
     'rel_image' => '/images',
     'document_path' => '/a/file/path',
     'path' => $this->path['document_path'].$this->path['rel_images']
);

or do I have to initial them one by one?

Upvotes: 1

Views: 87

Answers (4)

hakre
hakre

Reputation: 197599

The array still is undefined while you're defining it. However you can define other (temporary) variables to do so on the fly:

$this->path = array
(
     'rel_image' => $r = '/images',
     'document_path' => $p = '/a/file/path',
     'path' => $p.$r
);

However that normally should not be needed, as you're duplicating data within the array. Just saying, you can do whatever you want :)

Upvotes: 2

karllindmark
karllindmark

Reputation: 6071

As far as I know, the assignment you're trying to do isn't a functional one.

Code:

 <?php $array = array('foo' => 'bar', 'bar' => $array['foo']); ?>
 <pre><?php print_r($array); ?></pre>

...renders the following:

Array
(
    [foo] => bar
    [bar] => 
)

As the array is created at one time, not once per element, it will not be able to reference the values in the same statement as the assignment.

Upvotes: 0

cwallenpoole
cwallenpoole

Reputation: 81988

You have to initialize them one by one.

It is best to think of array as a constructor. The array itself doesn't completely exist until after the function call is complete, and you can't access something which doesn't completely exist in most circumstances.

Upvotes: 1

genesis
genesis

Reputation: 50966

yes, you have to initialize one by one, beacuse $this->path is being filled after array() function is done.

Upvotes: 0

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