This avoids the performance overhead of the function call every time `dirname( __FILE__ )` was used instead of `__DIR__`.
This commit also includes:
* Removing unnecessary parentheses from `include`/`require` statements. These are language constructs, not function calls.
* Replacing `include` statements for several files with `require_once`, for consistency:
* `wp-admin/admin-header.php`
* `wp-admin/admin-footer.php`
* `wp-includes/version.php`
Props ayeshrajans, desrosj, valentinbora, jrf, joostdevalk, netweb.
Fixes#48082.
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Splits wp-includes/embed-template.php, introduced in 4.4, into five new templates that can be individually overridden by themes:
* embed.php
* embed-404.php
* embed-content.php
* header-embed.php
* footer-embed.php
Also introduces a new template tag for outputting the site title, `the_embed_site_title()`.
The five new templates live in theme-compat, allowing for graceful fallbacks should themes prefer not to override any or all of them.
Props swissspidy, imath, ocean90, DrewAPicture.
See #34561.
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This change hooks these new output functions to existing hooks in the embed template, allowing for more straightforward display control of these elements.
Leaves the embed header and footer intact pending further modularization in a future release.
Props juliobox, swissspidy, DrewAPicture.
See #34561.
Built from https://develop.svn.wordpress.org/trunk@35689
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For the past 6 years, WordPress has operated as an oEmbed consumer, allowing users to easily embed content from other sites. By adding oEmbed provider support, this allows any oEmbed consumer to embed posts from WordPress sites.
In addition to creating an oEmbed provider, WordPress' oEmbed consumer code has been enhanced to work with any site that provides oEmbed data (as long as it matches some strict security rules), and provides a preview from within the post editor.
For security, embeds appear within a sandboxed iframe - the iframe content is a template that can be styled or replaced entirely by the theme on the provider site.
Props swissspidy, pento, melchoyce, netweb, pfefferle, johnbillion, extendwings, davidbinda, danielbachhuber, SergeyBiryukov, afercia
Fixes#32522.
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