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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 |
|---|---|
| 3235 | * |
| 3236 | * Allows to add filters to modify the way a cropped image is saved. |
| 3237 | * |
| 3238 | * @since 4.3.0 |
| 3239 | * |
| 3240 | * @param string $context The Customizer control requesting the cropped image. |
| 3241 | * @param int $attachment_id The attachment ID of the original image. |
| 3242 | * @param string $cropped Path to the cropped image file. |
| 3243 | */ |
| 3244 | do_action( 'wp_ajax_crop_image_pre_save', $context, $attachment_id, $cropped ); |
| 3245 | |
| 3246 | /** This filter is documented in wp-admin/custom-header.php */ |
| 3247 | $cropped = apply_filters( 'wp_create_file_in_uploads', $cropped, $attachment_id ); // For replication. |
| 3248 | |
| 3249 | $parent_url = wp_get_attachment_url( $attachment_id ); |
| 3250 | $url = str_replace( basename( $parent_url ), basename( $cropped ), $parent_url ); |
| 3251 | |
| 3252 | $size = @getimagesize( $cropped ); |
| 3253 | $image_type = ( $size ) ? $size['mime'] : 'image/jpeg'; |