[PHP-NOTES] note 130638 added to function.class-exists

Beware that class_exists is a runtime check and not a compile time check!

This means that even if the class is defined after the class_exists, it will return true!

<?php

echo 'Does class "MyClass" exist? : ', class_exists('MyClass') ? 'YES' : 'NO';

class MyClass
{
}

?>

Output: YES
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Server IP: 206.189.2.9
Probable Submitter: 95.98.156.14
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Manual Page -- https://php.net/manual/en/function.class-exists.php
Edit        -- https://main.php.net/note/edit/130638
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