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@ 2015-06-17T12:17:34Z

<?php

if ( class_exists( 'fooBar' ) ) {
    return;
}

class fooBar{
    //
}

echo 'Hello World!';

Output
Performance
VLD
References
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class_exists: documentation ( source)

preferences:dark modelive preview

60.95 ms | 402 KiB | 5 Q