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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 |
|---|---|
| 1915 | * Returning `true` will add the default value. |
| 1916 | * |
| 1917 | * @since 5.5.0 |
| 1918 | * |
| 1919 | * @param string|bool $value The `loading` attribute value. Returning a falsey value will result in |
| 1920 | * the attribute being omitted for the image. |
| 1921 | * @param string $image The HTML `img` tag to be filtered. |
| 1922 | * @param string $context Additional context about how the function was called or where the img tag is. |
| 1923 | */ |
| 1924 | $value = apply_filters( 'wp_img_tag_add_loading_attr', $value, $image, $context ); |
| 1925 | |
| 1926 | if ( $value ) { |
| 1927 | if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) { |
| 1928 | $value = 'lazy'; |
| 1929 | } |
| 1930 | |
| 1931 | return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image ); |
| 1932 | } |
| 1933 | |