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Asked: 2026-06-07T22:54:03+00:00

I’m trying to understand whether mysql_real_escape_string($str) can be empty if $str is not empty

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I’m trying to understand whether mysql_real_escape_string($str) can be empty if $str is not empty (by $str is empty I mean that empty($str) is true)?

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  1. Editorial Team

    mysql_real_escape_string

    Returns the escaped string, or FALSE on error.

    So the return value is either false if there’s an error (like not being connected to the database), which counts as "empty". Or it’s the escaped string, which means that there are additional escape characters in the string. mysql_real_escape_string will not reduce the string.

    So if the string has content and you are connected to the database, if the input is not "empty", the output won’t be either. If there’s an error though, the output will be "empty".

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