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Editing: Util_Mime.php

<?php
/**
 * File: Util_Mime.php
 *
 * @package W3TC
 */

namespace W3TC;

/**
 * Class Util_Mime
 *
 * phpcs:disable WordPress.PHP.NoSilencedErrors.Discouraged
 */
class Util_Mime {
	/**
	 * Returns file mime type
	 *
	 * @param string $file File.
	 *
	 * @return string
	 */
	public static function get_mime_type( $file ) {
		static $cache = array();

if ( ! isset( $cache[ $file ] ) ) {
			$mime_type = false;

/**
			 * Try to detect by extension (fast)
			 */
			$mime_types = include W3TC_INC_DIR . '/mime/all.php';

foreach ( $mime_types as $extension => $type ) {
				if ( preg_match( '~\.(' . $extension . ')$~i', $file ) ) {
					if ( is_array( $type ) ) {
						$mime_type = array_pop( $type );
					} else {
						$mime_type = $type;
					}

break;
				}
			}

/**
			 * Try to detect using file info function
			 */
			if ( ! $mime_type && function_exists( 'finfo_open' ) ) {
				$finfo = @finfo_open( FILEINFO_MIME );

if ( ! $finfo ) {
					$finfo = @finfo_open( FILEINFO_MIME );
				}

if ( $finfo ) {
					$mime_type = @finfo_file( $finfo, $file );

if ( $mime_type ) {
						$extra_mime_type_info = strpos( $mime_type, '; ' );

if ( $extra_mime_type_info ) {
							$mime_type = substr( $mime_type, 0, $extra_mime_type_info );
						}

if ( 'application/octet-stream' === $mime_type ) {
							$mime_type = false;
						}
					}

@finfo_close( $finfo );
				}
			}

/**
			 * Try to detect using mime type function
			 */
			if ( ! $mime_type && function_exists( 'mime_content_type' ) ) {
				$mime_type = @mime_content_type( $file );
			}

/**
			 * If detection failed use default mime type
			 */
			if ( ! $mime_type ) {
				$mime_type = 'application/octet-stream';
			}

$cache[ $file ] = $mime_type;
		}

return $cache[ $file ];
	}

/**
	 * Sections to mime types map
	 *
	 * @return array
	 */
	public static function sections_to_mime_types_map() {
		static $sections_to_mime_types_array = null;

if ( is_null( $sections_to_mime_types_array ) ) {
			$sections_to_mime_types_array = array(
				'cssjs' => include W3TC_INC_DIR . '/mime/cssjs.php',
				'html'  => include W3TC_INC_DIR . '/mime/html.php',
				'other' => include W3TC_INC_DIR . '/mime/other.php',
			);
		}

return $sections_to_mime_types_array;
	}

/**
	 * Mime type to section
	 *
	 * @param array $mime_type_match Mime type.
	 *
	 * @return array
	 */
	public static function mime_type_to_section( $mime_type_match ) {
		static $mime_type_to_section_array = null;

if ( is_null( $mime_type_to_section_array ) ) {
			$sections = self::sections_to_mime_types_map();

$mime_type_to_section_array = array();

foreach ( $sections as $section => $mime_types ) {
				foreach ( $mime_types as $mime_type ) {
					$mime_type_to_section_array[ $mime_type ] = $section;
				}
			}
		}

return isset( $mime_type_to_section_array[ $mime_type_match ] ) ? $mime_type_to_section_array[ $mime_type_match ] : null;
	}
}

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