Parse a CSS file with PHP

README.md

##Handles

• child selector >
• base64 images
• input[type="button"]:hover
• @media queries

##Example

            $css_contents = file_get_contents($url);
            
            $css_selectors=parse_css_selectors($css_contents);
            
            foreach($css_selectors as $block => $selector){
            
                if(!is_numeric($block)){
            
                    // open css media query
            
                    $css.= $block.' {';     
                }
            
                foreach($selector as $selector_name => $selector_data){
            
                    //open css selector
            
                    $css.=$selector_name.' {';
            
                    foreach($selector_data as $name => $value){
            
                        $css.=$name.':'.$value.';';
                    }
            
                    //close css selector
            
                    $css.= '}';
                }
            
                if(!is_numeric($block)){
            
                    // close css media query
            
                    $css.= '}';             
                }
            }

parse_css_selectors.php

	function parse_css_selectors($css,$media_queries=true){
		
		$result = $media_blocks = [];
		
		//---------------parse css media queries------------------
		
		if($media_queries==true){
		
			$media_blocks=parse_css_media_queries($css);
		}

		$b=0;		
		
		if(!empty($media_blocks)){
			
			//---------------get css blocks-----------------
			
			$css_blocks=$css;
			
			foreach($media_blocks as $media_block){
				
				$css_blocks=str_ireplace($media_block,'~£&#'.$media_block.'~£&#',$css_blocks);
			}
			
			$css_blocks=explode('~£&#',$css_blocks);
			
			//---------------parse css blocks-----------------
			
			foreach($css_blocks as $css_block){
				
				preg_match('/(\@media[^\{]+)\{(.*)\}\s+/ims',$css_block,$block);
				
				if(isset($block[2])&&!empty($block[2])){
					
					$result[$block[1]]=parse_css_selectors($block[2],false);
				}
				else{
					
					$result[$b]=parse_css_selectors($css_block,false);
				}
				
				++$b;
			}
		}
		else{
			
			//---------------escape base64 images------------------
			
			$css=preg_replace('/(data\:[^;]+);/i','$1~£&#',$css);
			
			//---------------parse css selectors------------------
			
			preg_match_all('/([^\{\}]+)\{([^\}]*)\}/ims', $css, $arr);

			foreach ($arr[0] as $i => $x){
				
				$selector = trim($arr[1][$i]);
				
				$rules = explode(';', trim($arr[2][$i]));
				
				$rules_arr = [];
				
				foreach($rules as $strRule){
					
					if(!empty($strRule)){
						
						$rule = explode(":", $strRule,2);
				
						if(isset($rule[1])){
							
							$rules_arr[trim($rule[0])] = str_replace('~£&#',';',trim($rule[1]));
						}
						else{
							//debug
						}
					}
				}

				$selectors = explode(',', trim($selector));
				
				foreach ($selectors as $strSel){
					
					if($media_queries===true){
					
						$result[$b][$strSel] = $rules_arr;
					}
					else{
						
						$result[$strSel] = $rules_arr;
					}
				}
			}
		}
		
		return $result;
	}
	
	function parse_css_media_queries($css){
		
		$mediaBlocks = array();

		$start = 0;
		while(($start = strpos($css, "@media", $start)) !== false){
			
			// stack to manage brackets
			$s = array();

			// get the first opening bracket
			$i = strpos($css, "{", $start);

			// if $i is false, then there is probably a css syntax error
			if ($i !== false){
				
				// push bracket onto stack
				array_push($s, $css[$i]);

				// move past first bracket
				$i++;

				while (!empty($s)){
					
					// if the character is an opening bracket, push it onto the stack, otherwise pop the stack
					if ($css[$i] == "{"){
						
						array_push($s, "{");
					}
					elseif ($css[$i] == "}"){
						
						array_pop($s);
					}

					$i++;
				}

				// cut the media block out of the css and store
				$mediaBlocks[] = substr($css, $start, ($i + 1) - $start);

				// set the new $start to the end of the block
				$start = $i;
			}
		}

		return $mediaBlocks;
	}