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Tell me how to find the length of a string?

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Tell me what are sql injections, how do you prevent them and what are the best practices?

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"mysql_fetch_row — Get a result row as an enumerated array",this sentence comes from the PHP offical manual.However ,i can not understand the words "enumerated array".I need some help.Thanks a lot to everyone that reply.

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how can attached a file to a mail and attached a resume to a mail and received in id

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Where is the submitted form data stored?

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Is php secure?

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