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Asked: 2026-06-15T18:58:33+00:00

I am using PHP version 5.3 and trying to use mysql_real_escape_string($unescaped_string) in my code,

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I am using PHP version 5.3 and trying to use mysql_real_escape_string($unescaped_string) in my code, but I get the error:

Fatal error: Call to undefined function mysql_real_escape_string() 
in /var/www/engine/database.php on line 38

I can still connect to the database however. Why is it not available?

I am using PHP version 5.3.

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1 Answer

  1. Editorial Team

    Update as mentioned in comment, mysql_ has been deprecated since 5.5:

    The mysql extension has been deprecated since PHP 5.5. The mysqli or PDO extension should be used instead. The deprecation has been decided in mysql_deprecation, where a discussion of the reasons behind this decision can be found.

    and removed in PHP 7.

    mysql_real_escape_string() is standard part of MySQL function “batch” and should always work if the extension is loaded correctly.

    Does any another mysql_ function work? (It should not)

    Make sure, that you have this line uncommented in your php.ini:

    extension=mysql.so

    Also it’d be wise to use mysqli or PDO instead (mysql_ is deprecated), they both can take care of escaping for you.

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