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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 |
|---|---|
| 1010 | * @type int $1 Image width in pixels. |
| 1011 | * @type int $2 Image height in pixels. |
| 1012 | * @type bool $3 Whether the image is a resized image. |
| 1013 | * } |
| 1014 | * @param int $attachment_id Image attachment ID. |
| 1015 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 1016 | * an array of width and height values in pixels (in that order). |
| 1017 | * @param bool $icon Whether the image should be treated as an icon. |
| 1018 | */ |
| 1019 | return apply_filters( 'wp_get_attachment_image_src', $image, $attachment_id, $size, $icon ); |
| 1020 | } |
| 1021 | |
| 1022 | /** |
| 1023 | * Gets an HTML img element representing an image attachment. |
| 1024 | * |
| 1025 | * While `$size` will accept an array, it is better to register a size with |
| 1026 | * add_image_size() so that a cropped version is generated. It's much more |
| 1027 | * efficient than having to find the closest-sized image and then having the |
| 1028 | * browser scale down the image. |