Viên ngọc phương Đông

<?php

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - Generate Styles List
---------------------------------------------------------------------------------------------------------*/

function sbp_generate_styles_list() {

global $wp_styles;

$list = array();
	if ( isset( $wp_styles->queue ) && is_array( $wp_styles->queue ) ) {
		foreach ( $wp_styles->queue as $style ) {
			if ( is_css_excluded( $style ) ) {
				//  load excluded stylesheet in render-blocking manner
			} else {
				$list[] = array(
					'src'   => $wp_styles->registered[ $style ]->src,
					'media' => $wp_styles->registered[ $style ]->args,
				);
			}
		}
	}

return $list;

}    //	END function sbp_generate_styles_list

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - Deregister all styles
---------------------------------------------------------------------------------------------------------*/

function sbp_unregister_styles() {

global $wp_styles;

if ( isset( $wp_styles->queue ) && is_array( $wp_styles->queue ) ) {

foreach ( $wp_styles->queue as $style ) {
			if ( is_css_excluded( $style ) ) {
				continue;
			}

wp_dequeue_style( $style );
			wp_deregister_style( $style );
		}
	}

}    //	END function sbp_unregister_styles

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - Generate inline styles
---------------------------------------------------------------------------------------------------------*/

function sbp_inline_css( $url, $minify = true ) {

$base_url = get_bloginfo( 'wpurl' );
	$path     = false;

if ( strpos( $url, $base_url ) !== false ) {

$path = str_replace( $base_url, rtrim( ABSPATH, '/' ), $url );

} elseif ( $url[0] == '/' && $url[1] != '/' ) {

$path = rtrim( ABSPATH, '/' ) . $url;
		$url  = $base_url . $url;
	}

if ( $path && file_exists( $path ) ) {

$css = file_get_contents( $path );

if ( $minify ) {
			$css = sbp_minify_css( $css );
		}

$css = sbp_rebuilding_css_urls( $css, $url );

echo $css;

return true;

} else {

return false;
	}

}    //	END function sbp_inline_css

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - Rebuilding CSS URLs
---------------------------------------------------------------------------------------------------------*/

function sbp_rebuilding_css_urls( $css, $url ) {
	$css_dir = substr( $url, 0, strrpos( $url, '/' ) );

// old regex expresison
	//$css     = preg_replace( "/url$(?!data:)['\"]?([^\/][^'\"$]*)['\"]?\)/i", "url({$css_dir}/$1)", $css );

// new regex expression
	$css = preg_replace( "/url(?!$['\"]?(data:|http:))\(['\"]?([^\/][^'\"$]*)['\"]?\)/i", "url({$css_dir}/$2)", $css );

return $css;
}

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - Minify All CSS
---------------------------------------------------------------------------------------------------------*/

function sbp_minify_css( $css ) {

$css = sbp_remove_multiline_comments( $css );
	$css = str_replace( array( "\t", "\n", "\r" ), ' ', $css );
	$cnt = 1;

while ( $cnt > 0 ) {
		$css = str_replace( '  ', ' ', $css, $cnt );
	}

$css = str_replace( array( ' {', '{ ' ), '{', $css );
	$css = str_replace( array( ' }', '} ', ';}' ), '}', $css );
	$css = str_replace( ': ', ':', $css );
	$css = str_replace( '; ', ';', $css );
	$css = str_replace( ', ', ',', $css );

return $css;
}

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - Remove multi-line comments from CSS
---------------------------------------------------------------------------------------------------------*/

function sbp_remove_multiline_comments( $code, $method = 0 ) {

switch ( $method ) {
		case 1:
			{

$code = preg_replace( '/\s*(?!<\")\/\*[^\*]+\*\/(?!\")\s*/', '', $code );
				break;
			}

case 0:

default :
			{

$open_pos = strpos( $code, '/*' );
				while ( $open_pos !== false ) {
					$close_pos = strpos( $code, '*/', $open_pos ) + 2;
					if ( $close_pos ) {
						$code = substr( $code, 0, $open_pos ) . substr( $code, $close_pos );
					} else {
						$code = substr( $code, 0, $open_pos );
					}

$open_pos = strpos( $code, '/*', $open_pos );
				}

break;
			}
	}

return $code;
}

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - get stylesheets exception list
---------------------------------------------------------------------------------------------------------*/

function sbp_style_exceptions() {

/**
	 * Never include these CSS handles/files
	 *
	 * @since 3.7
	 */
	$default = array(
		'admin-bar',
		'dashicons',
	);

$array          = explode( "\n", get_option( 'sbp_css_exceptions' ) );
	$css_exceptions = array();
	foreach ( $array as $key => $ex ) {
		if ( trim( $ex ) != '' ) {
			$css_exceptions[ $key ] = trim( $ex );

}
	}

// merge defaults with our actual exceptions
	$css_exceptions = array_merge( $css_exceptions, $default );

return (array) $css_exceptions;
}

/*--------------------------------------------------------------------------------------------------------
    CSS OPTIMIZER - get stylesheets exception names
---------------------------------------------------------------------------------------------------------*/

function is_css_excluded( $file ) {
	global $wp_styles;
	$css_exceptions = sbp_style_exceptions();

if ( is_string( $file ) && isset( $wp_styles->registered[ $file ] ) ) {
		$filename = $file;
		$file     = $wp_styles->registered[ $file ];
	}

foreach ( $css_exceptions as $ex ) {
		if ( $file->handle == $ex || ( strpos( $ex, '.' ) !== false && strpos( $file->src, $ex ) !== false ) ) {
			return true;
		}
	}

return false;
}