Iterating array of objects in PHP

Question

for($i = 0; $i < count($prices); $i++){
error_log($prices[$i]->anObjectVariable);
}

or

foreach ($prices as $price){
error_log($price->anObjectVariable);
}

None of these seems to work, here are the errors I get:

PHP Notice:  Undefined property: price::$anObjectVariable

this is the code which I use to prepare the object(s) and the array.

class price {

    public $anObjectVariable;

}

$prices = array();
    $p = new price();
    $p->anObjectVariable = "PRINT ME IN ERROR LOG!";
    array_push($prices, $p);

@metal_fan Presumably "why does PHP say that this property is not defined when it is part of the class definition." — cdhowie
– cdhowie, Commented Mar 21, 2013 at 17:06
error_log($prices[i]->anObjectVariable); should be error_log($prices[$i]->anObjectVariable);, I guess it's a typo ? — romainberger
– romainberger, Commented Mar 21, 2013 at 17:06
@romainberger Perhaps, but that wouldn't explain why the foreach variant also fails. — cdhowie
– cdhowie, Commented Mar 21, 2013 at 17:07
Have you tried var_dump($prices) and/or any other debugging? — user229044
– user229044 ♦, Commented Mar 21, 2013 at 17:07

Steve · Accepted Answer · 2013-03-21 17:13:56Z

4

I just tested it locally and the following code works fine if you define $prices as an array before you use it.

class price {

    public $anObjectVariable;

}

$prices = array();
$p = new price();
$p->anObjectVariable = "PRINT ME IN ERROR LOG!";
array_push($prices, $p);

for($i = 0; $i < count($prices); $i++){
    echo($prices[$i]->anObjectVariable);
}

Are you actually testing the code you show us above (i.e. the one I just posted above) or are you working on a derivative? Can you confirm that this exact snippet above works for you correctly?

answered Mar 21, 2013 at 17:13

Steve

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8 Comments

Crisp Over a year ago

Is correct. Php throws a warning if the array doesn't already exist. OP, dial up the error reporting.

Saturnix Over a year ago

no, in the code on which I'm working $prices is passed in as a variable in a function but it is declared, I'm sure of that.

Saturnix Over a year ago

Yeah, I'm sure of it because if I var_dump($prices) right before the loop I can see the array correctly...

Steve Over a year ago

Well, then again, I ask: Can you copy the code above and see if that one works for you. Because if it does, then you might have the first clue why your other code doesn't work.

Saturnix Over a year ago

Got the error! I've solved the typo of $i just to see there was another one. Fixed, thanks!

|

romainberger · Accepted Answer · 2013-03-21 17:12:22Z

2

Then if it's not a typo

for ($i = 0; $i < count($prices); $i++) {
    error_log($prices[$i]->anObjectVariable);
}

should work

answered Mar 21, 2013 at 17:12

romainberger

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1 Comment

romainberger Over a year ago

I tried with you code and it worked... which one of the errors do you get with this?

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