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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 |
|---|---|
| 1996 | * Returning `true` will add the default value. |
| 1997 | * |
| 1998 | * @since 5.7.0 |
| 1999 | * |
| 2000 | * @param string|bool $value The `loading` attribute value. Returning a falsey value will result in |
| 2001 | * the attribute being omitted for the iframe. Default 'lazy'. |
| 2002 | * @param string $iframe The HTML `iframe` tag to be filtered. |
| 2003 | * @param string $context Additional context about how the function was called or where the iframe tag is. |
| 2004 | */ |
| 2005 | $value = apply_filters( 'wp_iframe_tag_add_loading_attr', 'lazy', $iframe, $context ); |
| 2006 | |
| 2007 | if ( $value ) { |
| 2008 | if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) { |
| 2009 | $value = 'lazy'; |
| 2010 | } |
| 2011 | |
| 2012 | // Iframes should have source and dimension attributes for the `loading` attribute to be added. |
| 2013 | if ( false === strpos( $iframe, ' src="' ) || false === strpos( $iframe, ' width="' ) || false === strpos( $iframe, ' height="' ) ) { |
| 2014 | return $iframe; |