php - code on a jpg image generated dynamically -

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while looking info, came across image on forum didn't understood how worked. jpg image tells ip address , browser. think maybe made modifying htacess , replacing php jpg, , php generating image dynamically i'm not sure it.

would way works?

here image saw: http://www.danasoft.com/sig/475388.jpg

thanks

it nothing etching text on image. there several options it. using php see here , java see here


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