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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 |
|---|---|
| 2007 | * Returning `true` will add the default value. |
| 2008 | * |
| 2009 | * @since 5.7.0 |
| 2010 | * |
| 2011 | * @param string|bool $value The `loading` attribute value. Returning a falsey value will result in |
| 2012 | * the attribute being omitted for the iframe. Default 'lazy'. |
| 2013 | * @param string $iframe The HTML `iframe` tag to be filtered. |
| 2014 | * @param string $context Additional context about how the function was called or where the iframe tag is. |
| 2015 | */ |
| 2016 | $value = apply_filters( 'wp_iframe_tag_add_loading_attr', 'lazy', $iframe, $context ); |
| 2017 | |
| 2018 | if ( $value ) { |
| 2019 | if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) { |
| 2020 | $value = 'lazy'; |
| 2021 | } |
| 2022 | |
| 2023 | return str_replace( '<iframe', '<iframe loading="' . esc_attr( $value ) . '"', $iframe ); |
| 2024 | } |
| 2025 | |