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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 |
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456 |
|
457 | /** |
458 | * Filters the `$orientation` value to correct it before rotating or to prevemnt rotating the image. |
459 | * |
460 | * @since 5.3.0 |
461 | * |
462 | * @param int $orientation EXIF Orientation value as retrieved from the image file. |
463 | * @param string $file Path to the image file. |
464 | */ |
465 | $orientation = apply_filters( 'wp_image_maybe_exif_rotate', $orientation, $this->file ); |
466 |
|
467 | if ( ! $orientation || 1 === $orientation ) { |
468 | return false; |
469 | } |
470 |
|
471 | switch ( $orientation ) { |
472 | case 2: |
473 | // Flip horizontally. |
474 | $result = $this->flip( true, false ); |