PHP Array element returning null when accessed directly

Question

Any idea why this would happen?

code:

<?php
print_r($this->$property);
var_dump($this->$property[0]);
?>

output:

Array
(
    [0] => WP_Post Object
        (
            [ID] => 34901
            [post_author] => 1
            [post_date] => 2013-01-04 21:04:34
            [post_date_gmt] => 2013-01-05 02:04:34
            [post_content] => 
            [post_title] => Castro Theater  
            [post_excerpt] => 
            [post_status] => publish
            [comment_status] => open
            [ping_status] => open
            [post_password] => 
            [post_name] => castro-theater
            [to_ping] => 
            [pinged] => 
            [post_modified] => 2013-01-04 21:04:34
            [post_modified_gmt] => 2013-01-05 02:04:34
            [post_content_filtered] => 
            [post_parent] => 0
            [guid] => http://demo.gala.local/2012/venues/castro-theater/
            [menu_order] => 0
            [post_type] => venue
            [post_mime_type] => 
            [comment_count] => 0
            [filter] => raw
            [p2p_id] => 34444
            [p2p_from] => 34891
            [p2p_to] => 34901
            [p2p_type] => scheduleitem_to_venue
        )

)
NULL

If you are accessing a class property, you shoudl $this -> property[0] — Starx
– Starx, Commented Jan 13, 2013 at 3:10
@Starx $property is a variable that contains the name of the property, not the property itself. — jessica
– jessica, Commented Jan 13, 2013 at 3:10
@Starx If you will notice from my example, I can access it using the variable, just not one of the elements inside. — jessica
– jessica, Commented Jan 13, 2013 at 3:15

El Yobo · Accepted Answer · 2013-01-13 03:15:08Z

1

Your code ends up processesing $property[0] first, then tries to fetch the property of your object with the result of that. If you get $this->$property first, then you can fetch things using the normal array notation and things will work as you expect.

$data = $this->$property;
var_dump($data[0]);

answered Jan 13, 2013 at 3:15

El Yobo

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1 Comment

jessica Over a year ago

Ah, I get it. Thanks! I have fixed it by using $this->{$property}[0]

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