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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 |
|---|---|
| 1810 | * Returning `true` will add the default value. |
| 1811 | * |
| 1812 | * @since 5.5.0 |
| 1813 | * |
| 1814 | * @param string|bool $value The `loading` attribute value. Returning a falsey value will result in |
| 1815 | * the attribute being omitted for the image. Default is `lazy`. |
| 1816 | * @param string $image The HTML `img` tag to be filtered. |
| 1817 | * @param string $context Additional context about how the function was called or where the img tag is. |
| 1818 | */ |
| 1819 | $value = apply_filters( 'wp_img_tag_add_loading_attr', 'lazy', $image, $context ); |
| 1820 | |
| 1821 | if ( $value ) { |
| 1822 | if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) { |
| 1823 | $value = 'lazy'; |
| 1824 | } |
| 1825 | |
| 1826 | // Images should have source and dimension attributes for the `loading` attribute to be added. |
| 1827 | if ( false === strpos( $image, ' src="' ) || false === strpos( $image, ' width="' ) || false === strpos( $image, ' height="' ) ) { |
| 1828 | return $image; |