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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 |
|---|---|
| 1876 | * Returning `true` will add the default value. |
| 1877 | * |
| 1878 | * @since 5.5.0 |
| 1879 | * |
| 1880 | * @param string|bool $value The `loading` attribute value. Returning a falsey value will result in |
| 1881 | * the attribute being omitted for the image. Default 'lazy'. |
| 1882 | * @param string $image The HTML `img` tag to be filtered. |
| 1883 | * @param string $context Additional context about how the function was called or where the img tag is. |
| 1884 | */ |
| 1885 | $value = apply_filters( 'wp_img_tag_add_loading_attr', 'lazy', $image, $context ); |
| 1886 | |
| 1887 | if ( $value ) { |
| 1888 | if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) { |
| 1889 | $value = 'lazy'; |
| 1890 | } |
| 1891 | |
| 1892 | // Images should have source and dimension attributes for the `loading` attribute to be added. |
| 1893 | if ( false === strpos( $image, ' src="' ) || false === strpos( $image, ' width="' ) || false === strpos( $image, ' height="' ) ) { |
| 1894 | return $image; |