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近期不少WordPress項目后臺升級到了最新的4.9以后，發(fā)現(xiàn)主題模版編輯器只能保存CSS樣式表，凡是PHP類的摸吧一律無法保存了，經(jīng)過google發(fā)現(xiàn)是新版WP的一個BUG，修復方案如下：

打開wp-admin/includes/file.php文件，刪除492-599行的如下代碼：

if ( $is_active && 'php' === $extension ) {

		$scrape_key = md5( rand() );
		$transient = 'scrape_key_' . $scrape_key;
		$scrape_nonce = strval( rand() );
		set_transient( $transient, $scrape_nonce, 60 ); // It shouldn't take more than 60 seconds to make the two loopback requests.

		$cookies = wp_unslash( $_COOKIE );
		$scrape_params = array(
			'wp_scrape_key' => $scrape_key,
			'wp_scrape_nonce' => $scrape_nonce,
		);
		$headers = array(
			'Cache-Control' => 'no-cache',
		);

		// Include Basic auth in loopback requests.
		if ( isset( $_SERVER['PHP_AUTH_USER'] ) && isset( $_SERVER['PHP_AUTH_PW'] ) ) {
			$headers['Authorization'] = 'Basic ' . base64_encode( wp_unslash( $_SERVER['PHP_AUTH_USER'] ) . ':' . wp_unslash( $_SERVER['PHP_AUTH_PW'] ) );
		}

		// Make sure PHP process doesn't die before loopback requests complete.
		@set_time_limit( 300 );

		// Time to wait for loopback requests to finish.
		$timeout = 100;

		$needle_start = "###### wp_scraping_result_start:$scrape_key ######";
		$needle_end = "###### wp_scraping_result_end:$scrape_key ######";

		// Attempt loopback request to editor to see if user just whitescreened themselves.
		if ( $plugin ) {
			$url = add_query_arg( compact( 'plugin', 'file' ), admin_url( 'plugin-editor.php' ) );
		} elseif ( isset( $stylesheet ) ) {
			$url = add_query_arg(
				array(
					'theme' => $stylesheet,
					'file' => $file,
				),
				admin_url( 'theme-editor.php' )
			);
		} else {
			$url = admin_url();
		}
		$url = add_query_arg( $scrape_params, $url );
		$r = wp_remote_get( $url, compact( 'cookies', 'headers', 'timeout' ) );
		$body = wp_remote_retrieve_body( $r );
		$scrape_result_position = strpos( $body, $needle_start );

		$loopback_request_failure = array(
			'code' => 'loopback_request_failed',
			'message' => __( 'Unable to communicate back with site to check for fatal errors, so the PHP change was reverted. You will need to upload your PHP file change by some other means, such as by using SFTP.' ),
		);
		$json_parse_failure = array(
			'code' => 'json_parse_error',
		);

		$result = null;
		if ( false === $scrape_result_position ) {
			$result = $loopback_request_failure;
		} else {
			$error_output = substr( $body, $scrape_result_position + strlen( $needle_start ) );
			$error_output = substr( $error_output, 0, strpos( $error_output, $needle_end ) );
			$result = json_decode( trim( $error_output ), true );
			if ( empty( $result ) ) {
				$result = $json_parse_failure;
			}
		}

		// Try making request to homepage as well to see if visitors have been whitescreened.
		if ( true === $result ) {
			$url = home_url( '/' );
			$url = add_query_arg( $scrape_params, $url );
			$r = wp_remote_get( $url, compact( 'cookies', 'headers', 'timeout' ) );
			$body = wp_remote_retrieve_body( $r );
			$scrape_result_position = strpos( $body, $needle_start );

			if ( false === $scrape_result_position ) {
				$result = $loopback_request_failure;
			} else {
				$error_output = substr( $body, $scrape_result_position + strlen( $needle_start ) );
				$error_output = substr( $error_output, 0, strpos( $error_output, $needle_end ) );
				$result = json_decode( trim( $error_output ), true );
				if ( empty( $result ) ) {
					$result = $json_parse_failure;
				}
			}
		}

		delete_transient( $transient );

		if ( true !== $result ) {

			// Roll-back file change.
			file_put_contents( $real_file, $previous_content );
			if ( function_exists( 'opcache_invalidate' ) ) {
				opcache_invalidate( $real_file, true );
			}

			if ( ! isset( $result['message'] ) ) {
				$message = __( 'An unidentified error has occurred.' );
			} else {
				$message = $result['message'];
				unset( $result['message'] );
			}
			return new WP_Error( 'php_error', $message, $result );
		}
	}

當然這個方法僅僅是WordPress官方出更新前的一個臨時替代方式，永久的解決還是稍安勿躁等官方的fix的update吧。