how to determine the file size of a remote file with ease?

unfortunately the fseek and ftell functions do not work with remote files (Http:// etc), filesize() seems not to work too, what can I else try? Do I need FTP? $fp=fopen('http://www2.rk-online.de/pdf/pdficon.gif','r'); echo filesize('http://www2.rk-online.de/pdf/pdficon.gif'); echo fseek($fp,0,SEEK_END ); echo ftell($fp); regards -- o----------0-¬---------O-·---¬----o---®-----o o O ° . | http://www.kiffen.de | pRoteçt y0ur bRaín |0 O ° ¤ ° · 0°·³°²'²³-¹'³´³°^°³~³²³°'³²²¨³²^³¹³²°²³`³º³°Þ ° o © ° . · | psychedelic experience | gott@kiffen.de | O ° o ° o-¬--o--0-----©-·--O-----o-----0-¤----------o 0 ° · ° . ¤ ·