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if php has any problems running, then a suitable error message will be displayed which will give you a clue as to what needs to be done next.
do a 'view source' in the web browser and you will probably find that you can see the source code of your php script. this means that the web server did not send the script to php for interpretation. something is wrong with the server configuration - double check the server configuration against the php installation instructions.
a function error can indicate whether a system may be running a specific database engine, or give clues as to how a web page or programmed or designed.
a function error can indicate whether a system may be running a specific database engine, or give clues as to how a web page or programmed or designed. this allows for deeper investigation into open database ports, or to look for specific bugs or weaknesses in a web page. by feeding different pieces of bad data, for example, an attacker can determine the order of authentication in a script, (from the line number errors) as well as probe for exploits that may be exploited in different locations in the script.