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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 |
|---|---|
| 331 | * @since 2.6.0 |
| 332 | * |
| 333 | * @param string $html HTML content for the image. |
| 334 | * @param int $id Attachment ID. |
| 335 | * @param string $alt Alternate text. |
| 336 | * @param string $title Attachment title. |
| 337 | * @param string $align Part of the class name for aligning the image. |
| 338 | * @param string $size Optional. Default is 'medium'. |
| 339 | */ |
| 340 | $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size ); |
| 341 | |
| 342 | return $html; |
| 343 | } |
| 344 | |
| 345 | /** |
| 346 | * Calculates the new dimensions for a downsampled image. |
| 347 | * |
| 348 | * If either width or height are empty, no constraint is applied on |
| 349 | * that dimension. |