<h2>File Contents: /home/planet5/www/wp-content/plugins/wp-rocket/inc/classes/optimization/CSS/class-minify.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/www/wp-content/plugins/wp-rocket/inc/classes/optimization/CSS/class-minify.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php
namespace WP_Rocket\Optimization\CSS;

use WP_Rocket\Logger\Logger;
use MatthiasMullie\Minify as Minifier;

/**
 * Minify CSS files
 *
 * @since 3.1
 * @author Remy Perona
 */
class Minify extends Abstract_CSS_Optimization {
	use Path_Rewriter;

	/**
	 * Minifies CSS files
	 *
	 * @since 3.1
	 * @author Remy Perona
	 *
	 * @param string $html HTML content.
	 * @return string
	 */
	public function optimize( $html ) {
		Logger::info( &#039;CSS MINIFICATION PROCESS STARTED.&#039;, [ &#039;css minification process&#039; ] );

		$html_nocomments = $this-&gt;hide_comments( $html );
		$styles          = $this-&gt;find( &#039;&lt;link\s+([^&gt;]+[\s&quot;\&#039;])?href\s*=\s*[\&#039;&quot;]\s*?([^\&#039;&quot;]+\.css(?:\?[^\&#039;&quot;]*)?)\s*?[\&#039;&quot;]([^&gt;]+)?\/?&gt;&#039;, $html_nocomments );

		if ( ! $styles ) {
			Logger::debug( &#039;No `&lt;link&gt;` tags found.&#039;, [ &#039;css minification process&#039; ] );
			return $html;
		}

		Logger::debug( &#039;Found &#039; . count( $styles ) . &#039; `&lt;link&gt;` tags.&#039;, [
			&#039;css minification process&#039;,
			&#039;tags&#039; =&gt; $styles,
		] );

		foreach ( $styles as $style ) {
			if ( preg_match( &#039;/(?:-|\.)min.css/iU&#039;, $style[2] ) ) {
				Logger::debug( &#039;Style is already minified.&#039;, [
					&#039;css minification process&#039;,
					&#039;tag&#039; =&gt; $style[0],
				] );
				continue;
			}

			if ( $this-&gt;is_external_file( $style[2] ) ) {
				Logger::debug( &#039;Style is external.&#039;, [
					&#039;css minification process&#039;,
					&#039;tag&#039; =&gt; $style[0],
				] );
				continue;
			}

			if ( $this-&gt;is_minify_excluded_file( $style ) ) {
				Logger::debug( &#039;Style is excluded.&#039;, [
					&#039;css minification process&#039;,
					&#039;tag&#039; =&gt; $style[0],
				] );
				continue;
			}

			$minify_url = $this-&gt;replace_url( $style[2] );

			if ( ! $minify_url ) {
				Logger::error( &#039;Style minification failed.&#039;, [
					&#039;css minification process&#039;,
					&#039;tag&#039; =&gt; $style[0],
				] );
				continue;
			}

			$replace_style = str_replace( $style[2], $minify_url, $style[0] );
			$replace_style = str_replace( &#039;&lt;link&#039;, &#039;&lt;link data-minify=&quot;1&quot;&#039;, $replace_style );
			$html          = str_replace( $style[0], $replace_style, $html );

			Logger::info( &#039;Style minification succeeded.&#039;, [
				&#039;css minification process&#039;,
				&#039;url&#039; =&gt; $minify_url,
			] );
		}

		return $html;
	}

	/**
	 * Creates the minify URL if the minification is successful
	 *
	 * @since 2.11
	 * @author Remy Perona
	 *
	 * @param string $url Original file URL.

	 * @return string|bool The minify URL if successful, false otherwise
	 */
	private function replace_url( $url ) {
		if ( empty( $url ) ) {
			return false;
		}

		$unique_id = md5( $url . $this-&gt;minify_key );
		$filename  = preg_replace( &#039;/\.(css)$/&#039;, &#039;-&#039; . $unique_id . &#039;.css&#039;, ltrim( rocket_realpath( rocket_extract_url_component( $url, PHP_URL_PATH ) ), &#039;/&#039; ) );

		$minified_file = $this-&gt;minify_base_path . $filename;
		$minify_url    = $this-&gt;get_minify_url( $filename, $url );

		if ( rocket_direct_filesystem()-&gt;exists( $minified_file ) ) {
			Logger::debug( &#039;Minified CSS file already exists.&#039;, [
				&#039;css minification process&#039;,
				&#039;path&#039; =&gt; $minified_file,
			] );
			return $minify_url;
		}

		$file_path = $this-&gt;get_file_path( $url );

		if ( ! $file_path ) {
			Logger::error( &#039;Couldn’t get the file path from the URL.&#039;, [
				&#039;css minification process&#039;,
				&#039;url&#039; =&gt; $url,
			] );
			return false;
		}

		$minified_content = $this-&gt;minify( $file_path, $minified_file );

		if ( ! $minified_content ) {
			Logger::error( &#039;No minified content.&#039;, [
				&#039;css minification process&#039;,
				&#039;path&#039; =&gt; $minified_file,
			] );
			return false;
		}

		$save_minify_file = $this-&gt;write_file( $minified_content, $minified_file );

		if ( ! $save_minify_file ) {
			Logger::error( &#039;Minified CSS file could not be created.&#039;, [
				&#039;css minification process&#039;,
				&#039;path&#039; =&gt; $minified_file,
			] );
			return false;
		}

		Logger::debug( &#039;Minified CSS file successfully created.&#039;, [
			&#039;css minification process&#039;,
			&#039;path&#039; =&gt; $minified_file,
		] );

		return $minify_url;
	}

	/**
	 * Minifies the content
	 *
	 * @since 2.11
	 * @author Remy Perona
	 *
	 * @param string|array $file          File to minify.
	 * @param string       $minified_file Target filepath.
	 * @return string|bool
	 */
	protected function minify( $file, $minified_file ) {
		$file_content = $this-&gt;get_file_content( $file );

		if ( ! $file_content ) {
			return false;
		}

		$file_content     = $this-&gt;rewrite_paths( $file, $minified_file, $file_content );
		$minifier         = $this-&gt;get_minifier( $file_content );
		$minified_content = $minifier-&gt;minify();

		if ( empty( $minified_content ) ) {
			return false;
		}

		return $minified_content;
	}

	/**
	 * Returns a new minifier instance
	 *
	 * @since 3.1
	 * @author Remy Perona
	 *
	 * @param string $file_content Content to minify.
	 * @return Minifier\CSS
	 */
	protected function get_minifier( $file_content ) {
		return new Minifier\CSS( $file_content );
	}
}
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