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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 552 | $title = wxr_cdata( apply_filters( 'the_title_export', $post->post_title ) ); |
| 553 | |
| 554 | /** |
| 555 | * Filters the post content used for WXR exports. |
| 556 | * |
| 557 | * @since 2.5.0 |
| 558 | * |
| 559 | * @param string $post_content Content of the current post. |
| 560 | */ |
| 561 | $content = wxr_cdata( apply_filters( 'the_content_export', $post->post_content ) ); |
| 562 | |
| 563 | /** |
| 564 | * Filters the post excerpt used for WXR exports. |
| 565 | * |
| 566 | * @since 2.6.0 |
| 567 | * |
| 568 | * @param string $post_excerpt Excerpt for the current post. |
| 569 | */ |
| 570 | $excerpt = wxr_cdata( apply_filters( 'the_excerpt_export', $post->post_excerpt ) ); |