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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 | 
|---|---|
| 1557 |       * | 
| 1558 |       * @since 5.5.0 | 
| 1559 |       * | 
| 1560 |       * @param bool   $match          Whether the image relative path from the image meta | 
| 1561 |       *                               matches the end of the URI or path to the image file. | 
| 1562 |       * @param string $image_location Full path or URI to the tested image file. | 
| 1563 |       * @param array  $image_meta     The image meta data as returned by 'wp_get_attachment_metadata()'. | 
| 1564 |       * @param int    $attachment_id  The image attachment ID or 0 if not supplied. | 
| 1565 |       */ | 
| 1566 |      return apply_filters( 'wp_image_file_matches_image_meta', $match, $image_location, $image_meta, $attachment_id ); | 
| 1567 | } | 
| 1568 |  | 
| 1569 | /** | 
| 1570 |  * Determines an image's width and height dimensions based on the source file. | 
| 1571 |  * | 
| 1572 |  * @since 5.5.0 | 
| 1573 |  * | 
| 1574 |  * @param string $image_src     The image source file. | 
| 1575 |  * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'. |