Gracias
GatorV, pero me queda una duda: en mi pc me funciona (localhost) si pongo getimagesize("http://dominio.com/imagen.jpg")..., por que?
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En el servidor donde tengo mi web me pone
Warning: getimagesize(): URL file-access is disabled in the server configuration in ... on line 3
Warning: getimagesize(http://www.blackcreativebox.com/imag...osdelweb.png): failed to open stream: no suitable wrapper could be found in ... on line 3