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Testing if class is defined returns a notice

Posted on 2013-11-09
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Last Modified: 2013-11-09
Im trying to check if a class is defined, and if it isnt then define it, so I used:-
if (!class_exists(DB)) {
     echo "Class doesnt exist";
}

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However when I run it, I get the echo statment, but along with:-
Notice: Use of undefined constant DB - assumed 'DB' in /var/www/vhosts/htdocs/dbConf.php on line 15

I know I can swtich warnings and notices off, but during development I prefer to keep them switched on.

Ive also tried using:-
if (!defined(DB)) {
     echo "Class doesnt exist";
}

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But get the same results :-S

Any advice???
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Question by:tonelm54
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2 Comments
 
LVL 31

Accepted Solution

by:
Marco Gasi earned 2000 total points
ID: 39635570
You have to use quotes:

if (!class_exists('DB')) {
     echo "Class doesnt exist";
}

Open in new window

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LVL 31

Expert Comment

by:Marco Gasi
ID: 39635571
Function class_exists89 requires the first parameter is a string, taht is the class name, not the class itself: http://php.net/manual/en/function.class-exists.php

Cheers
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