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El ususario coge su Firefox y entra en 
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En 
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Este Apache ve que le est&aacute;n pidiendo 
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www.gul.es/
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index.php
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PHP despierta y ejecuta el c&oacute;digo de 
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index.php
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index.php
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Apache decide que 
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index.php 
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  <element x='447' y='295' r='1.000000' g='1.000000' b='1.000000' a='0.101852' fadein='builtin:alpha' fadeout='builtin:alpha'>
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corresponde a un programa PHP
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Apache le pasa la petici&oacute;n a PHP
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www.gul.es 
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hay un Apache escuchando
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Este c&oacute;digo PHP genera una p&aacute;gina XHTML
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Cuando PHP acaba de ejecutarse, Apache recoge el XHTML generado
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Apache manda el XHTML al usuario
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El usuario ni se entera de que PHP ha estado funcionando
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