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PHP - Delete Object from array while in a foreach loop iterating that array

Posted on 2013-11-13
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Last Modified: 2013-11-13
Hi,

I am hoping this is a simple question with a simple answer that I am just not seeing.

I have an array of existing people objects, and an array of people objects that need to be removed from the list of existing people.

foreach($entity->removals as $removal){
    foreach($entity->existing_list as $existing){
        if($removal->get_id() == $existing->get_id()){
                //is there a simple way to remove $existing from $entity->existing_list
        }
    }
}

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Question by:jrm213jrm213
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6 Comments
 
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Assisted Solution

by:Ray Paseur
Ray Paseur earned 500 total points
ID: 39645022
You can use an array key in foreach(). Can you show us a bit of test data?
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LVL 109

Accepted Solution

by:
Ray Paseur earned 500 total points
ID: 39645026
Untested but possibly correct...

foreach($entity->removals as $removal){
    foreach($entity->existing_list as $key => $existing){
        if($removal->get_id() == $existing->get_id()){
            unset($entity->existing_list[$key]);
        }
    }
}

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Author Comment

by:jrm213jrm213
ID: 39645053
interesting so changing the structure of the foreach like that makes $key into the index of the array while putting the value into $existing. I didn't realize it worked that way. Thanks!
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Author Closing Comment

by:jrm213jrm213
ID: 39645059
Thanks!
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Expert Comment

by:Ray Paseur
ID: 39645153
Thanks for the points.  You might find some value in this article...
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_12310-PHP-Variables-and-References.html

Best regards, ~Ray
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LVL 17

Author Comment

by:jrm213jrm213
ID: 39645172
yeah in the past when I wanted to modify the object for the current iteration I just made the for loop like this

foreach($list as &$list_item){
}

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which would make list_item as a reference instead of a value, but that doesn't help when you need to remove $list_item from the list, it just lets you modify that item in the list.
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