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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 |
|---|---|
| 842 | * |
| 843 | * @since 4.3.0 |
| 844 | * |
| 845 | * @param array|false $image Either array with src, width & height, icon src, or false. |
| 846 | * @param int $attachment_id Image attachment ID. |
| 847 | * @param string|array $size Size of image. Image size or array of width and height values |
| 848 | * (in that order). Default 'thumbnail'. |
| 849 | * @param bool $icon Whether the image should be treated as an icon. Default false. |
| 850 | */ |
| 851 | return apply_filters( 'wp_get_attachment_image_src', $image, $attachment_id, $size, $icon ); |
| 852 | } |
| 853 | |
| 854 | /** |
| 855 | * Get an HTML img element representing an image attachment |
| 856 | * |
| 857 | * While `$size` will accept an array, it is better to register a size with |
| 858 | * add_image_size() so that a cropped version is generated. It's much more |
| 859 | * efficient than having to find the closest-sized image and then having the |
| 860 | * browser scale down the image. |