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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 |
|---|---|
| 4059 | * |
| 4060 | * Allows to add filters to modify the way a cropped image is saved. |
| 4061 | * |
| 4062 | * @since 4.3.0 |
| 4063 | * |
| 4064 | * @param string $context The Customizer control requesting the cropped image. |
| 4065 | * @param int $attachment_id The attachment ID of the original image. |
| 4066 | * @param string $cropped Path to the cropped image file. |
| 4067 | */ |
| 4068 | do_action( 'wp_ajax_crop_image_pre_save', $context, $attachment_id, $cropped ); |
| 4069 | |
| 4070 | /** This filter is documented in wp-admin/includes/class-custom-image-header.php */ |
| 4071 | $cropped = apply_filters( 'wp_create_file_in_uploads', $cropped, $attachment_id ); // For replication. |
| 4072 | |
| 4073 | // Copy attachment properties. |
| 4074 | $attachment = wp_copy_parent_attachment_properties( $cropped, $attachment_id, $context ); |
| 4075 | |
| 4076 | $attachment_id = wp_insert_attachment( $attachment, $cropped ); |
| 4077 | $metadata = wp_generate_attachment_metadata( $attachment_id, $cropped ); |