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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 |
|---|---|
| 321 | * Filter the value of the attachment's image tag class attribute. |
| 322 | * |
| 323 | * @since 2.6.0 |
| 324 | * |
| 325 | * @param string $class CSS class name or space-separated list of classes. |
| 326 | * @param int $id Attachment ID. |
| 327 | * @param string $align Part of the class name for aligning the image. |
| 328 | * @param string $size Optional. Default is 'medium'. |
| 329 | */ |
| 330 | $class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size ); |
| 331 | |
| 332 | $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" ' . $title . $hwstring . 'class="' . $class . '" />'; |
| 333 | |
| 334 | /** |
| 335 | * Filter the HTML content for the image tag. |
| 336 | * |
| 337 | * @since 2.6.0 |
| 338 | * |
| 339 | * @param string $html HTML content for the image. |