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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 |
|---|---|
| 275 | * @param array $imagesize { |
| 276 | * Indexed array of the image width and height in pixels. |
| 277 | * |
| 278 | * @type int $0 The image width. |
| 279 | * @type int $1 The image height. |
| 280 | * } |
| 281 | * @param string $file Full path to the uploaded image file. |
| 282 | * @param int $attachment_id Attachment post ID. |
| 283 | */ |
| 284 | $threshold = (int) apply_filters( 'big_image_size_threshold', 2560, $imagesize, $file, $attachment_id ); |
| 285 | |
| 286 | // If the original image's dimensions are over the threshold, |
| 287 | // scale the image and use it as the "full" size. |
| 288 | if ( $threshold && ( $image_meta['width'] > $threshold || $image_meta['height'] > $threshold ) ) { |
| 289 | $editor = wp_get_image_editor( $file ); |
| 290 | |
| 291 | if ( is_wp_error( $editor ) ) { |
| 292 | // This image cannot be edited. |
| 293 | return $image_meta; |