How are the rewrite rules generated in wp_options?

Can you explain how this json string is generated in the rewrite_rules.
select option_value from wp_options WHERE option_name = 'rewrite_rules'

It looks like all plugins write into this if they have rewrite rules. What does s:53: and s:99: stand for and how do you know how the rules are set?

Is there any priority as well like if the top rule gets hit then it uses that first? How do you make sure the rules do not overlap?

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  • Adam Czajczyk

    Hello Candance,

    I hope you're well today and thank you for your question!

    These are additional URL rewrite rules that are added by the plugins and do not exist in .htaccess file. Such rewrites should be added and handled using core WP functions and WP stores them in that database field.

    The plugin adds the rule (see: add_rewrite_rule()) and the WordPress handles these rules (see here).

    Rewrite rules are strictly related to URLs and these are unique for different plugins. It may however happen that e.g. two rules result in two separate URL's pointing to the same page as a result. That's not unusual but it's usually also nothing wrong :slight_smile:

    Rules should be handled in the same fashion as ".htaccess" rules are: from first to last, unless it's reverted when the rule is added.

    As for "s:53" etc. The data in that you posted is stored in form of serialized array. The "s:53" or "s:99" is a part that specifies the length of a string (value) right behind it. For example (check the count the number or characters between quotation marks):

    s3:"ABC"
    
    s1:"X"
    
    s5:"DE1G2"

    Best regards,
    Adam

  • Candace

    Hey Adam,
    Thanks for the response. That helped me out a lot. One thing I was wondering though if you really wanted to scale a site with millions of posts and a lot of traffic then wouldn't you rather have these rewrite rules in .htaccess? Or does it not matter since they are cached most of the time?

    One last part if they are first to last and let's say coursepress is more important than another plugin then can you somehow make it come higher up ?

    Lastly, besides normal SQL to query these fields to make sure the settings are correct then is there a way to use something within mysql workbench or mysql besides a like '%string%' to query these json type fields in a database?

  • Dimitris

    Hello Candace,

    hope you're doing good and don't mind chiming in! :slight_smile:

    if you really wanted to scale a site with millions of posts and a lot of traffic then wouldn't you rather have these rewrite rules in .htaccess? Or does it not matter since they are cached most of the time?

    I don't think that this would made any difference as they both use Apache's mod_rewrite module.

    if they are first to last and let's say coursepress is more important than another plugin then can you somehow make it come higher up ?

    This could be changed by changing the loading order of your plugins.
    Plugin Organizer https://wordpress.org/plugins/plugin-organizer/ could be a handy solution for this.

    besides normal SQL to query these fields to make sure the settings are correct then is there a way to use something within mysql workbench or mysql besides a like '%string%' to query these json type fields in a database?

    All rules are stored in database in the wp_options table under rewrite_rules field. That table record should be enough for you. :wink:

    Warm regards,
    Dimitris

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