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CREATING PLUGINS
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In this chapter, I ve shown you all the basics of WordPress plugin development: adding options forms, creating template tags and shortcodes, checking user capabilities, filtering content, and adding your own functions to action hooks. I ve also gone over the process of publishing a plugin on WordPress Extend, including how to create a readme.txt file, localize your plugin, and upload it using Subversion. While I have by no means shown you everything you will ever need to know about writing plugins for WordPress, I hope I have given you a solid foundation for further research. As always, the Codex should be your first stop when you need to find a function or look up an action hook. If the relevant Codex is incomplete and I m sorry to say the end-user documentation is far more complete than that for developers try searching the forums, Google, the PHPdocs, and the Xref documentation. In this chapter, I ve shown you very briefly how to check for users capabilities in your plugins. In the next chapter, you ll learn all about the built-in roles and capabilities in WordPress. You ll also learn how to change them to suit your needs.
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C H A P T E R 10
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Users and Roles
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WordPress has five built-in user roles with escalating permissions. The basic role and notification systems work well for many blogs, but they re too limited for more complex content management. Fortunately, the developers have indicated that the roles will be overhauled in an upcoming version (perhaps 3.1). In the meantime, they can be modified if you re willing to dig into some PHP or install a couple of plugins: you can change the fields in the basic user profile, modify roles, and create whole new roles. I ll look at all the code (or plugin settings) required to make these changes.
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Users
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If you changed your password just after you installed WordPress, you ve already seen the user profile page (Figure 10-1). You can reach it by going to Users Your Profile in the navigation menu. You might not have noticed, but you were assigned the administrator role.
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Figure 10-1. A user profile
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USERS AND ROLES
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In the personal options section, you can determine how the WordPress administration screens will work for you. You can disable the visual (rich text) editor on the content editing screens and you can switch the color scheme to blue. See codex.wordpress.org/Keyboard_Shortcuts for the full list of comment moderation shortcuts you ll have if you enable keyboard shortcuts for comment moderation. Note that the username you chose when you installed WordPress cannot be changed unless you edit the database field directly (with PHPMyAdmin, for example). You could also create another user, give it the administrator role, and log in with that account instead. The first and last name fields should be self-explanatory. The nickname field works much like a post s slug. It s used in the URL to your author archive page (which we talked about in 6) and can be used in some functions that retrieve user profile data. The display name setting determines how your name will appear on your site: in your post/page bylines, on your author archive pages, and in your comments (f you re logged in when you leave a comment). Your e-mail address will be used for all the notifications you, personally, will receive from WordPress. While the e-mail you specified in Settings General will be used for system notifications, you ll be notified at the address you provide here about every comment on posts you ve written, if you ve checked the appropriate setting in Settings Discussion. If you forget your password, you ll be able to reset it by having a new one sent to this address. Note that users can t have duplicate e-mail addresses; if you need to create additional accounts for yourself as you test various features, you ll have to use a different address for each one. The URL you enter here will be used if your theme supports author links in bylines. Your name will also be linked to this URL if you are logged in when commenting. The biography field is not often used in themes, but some display it as a post footer in a multiauthor blog or in the sidebar of the author archive template. This field accepts a limited set of HTML tags the same ones allowed in comments, in fact. All other tags will be removed. The allowed tags (and attributes) in all filtered HTML fields are shown in Listing 10-1. Listing 10-1. HTML tags and attributes allowed in filtered HTML fields <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong> WordPress uses Gravatars (gravatar.com) for its user avatars. If a user has a Gravatar associated with his or her e-mail address, it will be shown in the administration screens and in any theme that supports avatars. As an administrator, you can edit other users profiles as well as your own. No other role has this capability.
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