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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 |
---|---|
574 | * @deprecated 3.5.0 |
575 | */ |
576 | public function wp_set_background_image() { |
577 | if ( ! current_user_can( 'edit_theme_options' ) || ! isset( $_POST['attachment_id'] ) ) { |
578 | exit; |
579 | } |
580 | $attachment_id = absint( $_POST['attachment_id'] ); |
581 | /** This filter is documented in wp-admin/includes/media.php */ |
582 | $sizes = array_keys( |
583 | apply_filters( |
584 | 'image_size_names_choose', |
585 | array( |
586 | 'thumbnail' => __( 'Thumbnail' ), |
587 | 'medium' => __( 'Medium' ), |
588 | 'large' => __( 'Large' ), |
589 | 'full' => __( 'Full Size' ), |
590 | ) |
591 | ) |
592 | ); |