devo aggiornare in phpstats alcune immagini,

per esempio questa immagine è data da questo codice:

Codice PHP:
 case 'Chrome': return $tmp.= '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'; 
come faccio partendo da un'immagine a generare quel codice in modo da inserirla in caratteri come sopra?