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<?php //this code will append a &mobileapp to every url ob_start(function($buffer){ $append = 'mobileapp'; $domain = '(?:'.preg_quote('example.com/~hillybilly') .'|'. '(?.*?\.)?'.preg_quote('foobar.com') .')'; $regex = '/\b(https?:\/\/'.$domain .'\/?)([a-z0-9\._\/~%\-\+&\#!=\(\)@]*)?([?])?([a-z0-9\._\/~%\-\+&\#!=\(\)@]*)?/igm'; $buffer = preg_replace($regex, '$1$2?'.$append.'&$4', $buffer); return $buffer; }); ?> http://foobar.com http://www.example.com/~hillybilly/foobar.php
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