Class WP_Block_Parser_Frame
WP_Block_Parser_Block
Class WP_Block_Parser_Block
WP_Ajax_Response
Send XML response back to Ajax request.
WP_Admin_Bar
Core class used to implement the Toolbar API.
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Walker_Page
Core walker class used to create an HTML list of pages.
Walker_PageDropdown
Core class used to create an HTML drop-down list of pages.
Walker_Nav_Menu
Core class used to implement an HTML list of nav menu items.
Walker_Comment
Core walker class used to create an HTML list of comments.
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Walker_Category
Core class used to create an HTML list of categories.
Walker_CategoryDropdown
Core class used to create an HTML dropdown list of Categories.
Snoopy
SMTP
PHPMailer RFC821 SMTP email transport class.
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SimplePie
SimplePie
Requests
Requests for PHP
POP3
mail_fetch/setup.php