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Home/ Questions/Q 6079247
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T10:55:30+00:00 2026-05-23T10:55:30+00:00

What does mysql_real_escape_string() do with the % (percent) character and how much of a

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What does mysql_real_escape_string() do with the % (percent) character and how much of a security risk does it represent (and how to fix it)?

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  1. Editorial Team
    Editorial Team
    2026-05-23T10:55:31+00:00Added an answer on May 23, 2026 at 10:55 am

    From the mysql_real_escape_string() documentation:

    Note: mysql_real_escape_string() does not escape % and _. These are
    wildcards in MySQL if combined with
    LIKE, GRANT, or REVOKE.

    As far as security, unless you are running a LIKE, GRANT, or REVOKE, it’s a non-issue. LIKE is probably the only real concern. It’s up to you how you would want to escape it in these situations.

    A quick example:

    "... LIKE '%" . mysql_real_escape_string($string) . "%' ..."
    
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