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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 |
|---|---|
| 392 | if ( !$combined ) |
| 393 | $filtered[++$i] = $changes[$j]; |
| 394 | } |
| 395 | $changes = $filtered; |
| 396 | unset($filtered); |
| 397 | } |
| 398 | |
| 399 | // image resource before applying the changes |
| 400 | if ( $image instanceof WP_Image_Editor ) |
| 401 | $image = apply_filters('wp_image_editor_before_change', $image, $changes); |
| 402 | elseif ( is_resource( $image ) ) |
| 403 | $image = apply_filters('image_edit_before_change', $image, $changes); |
| 404 | |
| 405 | foreach ( $changes as $operation ) { |
| 406 | switch ( $operation->type ) { |
| 407 | case 'rotate': |
| 408 | if ( $operation->angle != 0 ) { |
| 409 | if ( $image instanceof WP_Image_Editor ) |
| 410 | $image->rotate( $operation->angle ); |