Unsetting properties in an object

Question

I am trying to unset something in an object.

foreach($curdel as $key => $value) {
if ($value == $deletedinfo[0]) {
    print_r($key);
    print_r($curdel);
    unset($curdel[$key]);
}
}

As expected, $key returns the correct value (0) and $curdel returns the entire array. But trying to unset $curdel[$key] breaks everything. even trying to print_r($curdel[$key]) breaks everything, what am I missing?

My object looks like this:

stdClass Object ( [0] => IFSO14-03-21-14.csv [2] => EB_Bunny.jpg [3] => EB_White_Bear.jpg )

What do you mean - breaks everything? Any real error messages? — sybear
– sybear, Commented Mar 24, 2014 at 20:40
print_r $curdel returns: stdClass Object ( [0] => IFSO14-03-21-14.csv [2] => EB_Bunny.jpg [3] => EB_White_Bear.jpg ) — jrabramson
– jrabramson, Commented Mar 24, 2014 at 20:46
So you know for future questions, this data structure is an object with numeric properties, not an "object array". I suspect that if you use that phrase, people will assume you mean a class that implements the Iterator interface. — halfer
– halfer, Commented Mar 24, 2014 at 21:40

Aziz Saleh · Accepted Answer · 2014-03-24 20:51:10Z

4

Instead of:

unset($curdel[$key]);

Try:

unset($curdel->$key);

Arrays are accessed/modified via the [] but objects and class properties are accessed via the ->

answered Mar 24, 2014 at 20:51

Aziz Saleh

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2 Comments

jrabramson Over a year ago

This guy, this guy knows whats up.

Reed Over a year ago

Note: unset($obj->prop) DELETEs prop from the object, such that __get() and __set() will be invoked on future $obj->prop access, even if the property is declared as public.

Community · Accepted Answer · 2017-05-23 12:05:21Z

2

Possible solution to that problem is to add reference to $value variable:

foreach($curdel as $key => &$value) { //Note & sign
   if ($value == $deletedinfo[0]) {
       print_r($key);
       print_r($curdel);
       unset($curdel[$key]);
   }
}

&$value means a reference to an actual array element

Answer based also on this (similar) example: Unset an array element inside a foreach loop

UPDATE

Based in your input (STDClass instead of array): just cast $curdel to array first:

$curdel = (array) $curdel ;

Numeric indices in objects are kinda invalid and can be accessed only via special syntax like:

$object->{'0'} ;

which is a really bad practice.

edited May 23, 2017 at 12:05

CommunityBot

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answered Mar 24, 2014 at 20:43

sybear

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3 Comments

jrabramson Over a year ago

The foreach and if didn't seem to be the issues as the two print_r are going off.

sybear Over a year ago

Seriously, just explain what input you have and what final result you need to get. Post more code that could possibly cause the problem and we will help you. Breaks everything is the same as ERROR_NOT_FOUND

halfer Over a year ago

I think this is a good answer based on the information available at the time: object != object array!

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