PHP Out of Memory on ISSET()

Asked Jun 26 '15 at 12:14

Active Jun 26 '15 at 12:20

Viewed 186 times

I have this line of code that seems to be giving me the Out of Memory error on PHP.

 //Gives OOM when $list[0] is undeclared
 if(isset($list[0]) == false) { $message = 'Variable is not set. Unable to validate variable'; }

May I know if there's a way to check if a variable is undeclared and why is isset giving me an Out of Memory error?

edited Jun 26 '15 at 12:20

RiggsFolly

asked Jun 26 '15 at 12:14

toffee.beanns

1

`if(!isset($list[0]))` will work. – Sougata Bose Jun 26 '15 at 12:16
1

Better use ``!isset($list[0])`` instead of ``isset($list[0]) == false``. – user1438038 Jun 26 '15 at 12:17
What is the error saying actually? – Sougata Bose Jun 26 '15 at 12:20
If it's about not enough memory, you need to check your code. Do you get your $list variable from another include or smt? – mim. Jun 26 '15 at 12:21
What is the [memory limit](http://php.net/manual/en/ini.core.php#ini.memory-limit)? You can run `echo ini_get('memory_limit');` to find out. – Arnold Daniels Jun 26 '15 at 12:25
possible duplicate of [PHP Out of Memory - Crashes Apache?](http://stackoverflow.com/questions/1990216/php-out-of-memory-crashes-apache) – Machavity Jun 26 '15 at 12:25
1

The number of line that is indicated in the error message doesn't say that it is the line that causes the problem. It is just a line where the memory limit was met. This line could be in a loop that increments memory usage with each iteration. – n-dru Jun 26 '15 at 12:37
@b0s3 may i know whats the difference between them two? (!isset($list[0])) vs (isset($list[0]) == false) – toffee.beanns Jun 26 '15 at 14:42
It seem to go into an endless loop leading to OOM – toffee.beanns Jun 26 '15 at 14:43
It doesn't work though, I tried changing to (!isset($list[0]) – toffee.beanns Jun 26 '15 at 14:52
@toffee.beanns `isset` return `true` or `false`. So no need to do `isset($a) == false`. – Sougata Bose Jun 29 '15 at 04:22

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