PHP Function Checks if a Class Already Has Been Defined | dBuggr

PHP Function Checks if a Class Already Has Been Defined

smallwei 9:23 pm on November 30, 2009 | Answers: 1
Tags: check (12), class (7), function (49), order (6), php (40)

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PHP function checks if a class already has been defined
Sometime you might run into problems in PHP where a class is already being defined. In order to avoid defining the same class twice, you can use class_exists function to do the check first.
- smallwei 9:23 pm on November 30, 2009
  class_exists – Checks if the class has been defined
  Returns TRUE if class_name is a defined class, FALSE otherwise
  
  Example:
```
<?php  if (class_exists('Disqus')) {
    $disqus = new Disqus($disqus_vars['user_api_key']);
  } else {
    require('disqus.php');
    $disqus = new Disqus($disqus_vars['user_api_key']);
  }
?>
```
  More examples @ http://php.net/manual/en/function.class-exists.php
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