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Empezado por dec
Sin embargo, no parece que ello deba utilizarse para según qué casos
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De hecho, el mismo manual de PHP advierte contra su uso:
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The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted.
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// Saludos