<?php

 class SecureLabFilters {
 
	public function __construct() {
	
		return true;
	
	}
 
	public function ApplyFilter ( $String, $Filter ) {  

		$DefFilters = array (
		
		"" => "1",
		
		"P2" => "2",
		
		"P3" => "10",
		
		"B1" => "3", 
		
		"B2" => "4", 
		
		"B3" => "5", 
		
		"H1" => "6", 
		
		"H2" => "7",
		
		"C1" => "8",
		
		"C2" => "9"
		
		);
		
		
		if( !is_numeric( $Filter ) ) { 
			
			if( array_key_exists( $Filter, $DefFilters) )  {
			
				$FilterID = $DefFilters[ $Filter ];
			
			}
		
		}  else  {
		
			$FilterID = (int) $Filter;
		
		}
		
			switch($FilterID) {
				
				case 1: 
				
					// Filter ID1: Primary 1, allowed: {english , . ; : ( ) num @}
					
					preg_match_all("/[a-zA-Z0-9., ;¹()+_+-]*/", $String, $Match);
					
					$ResultToReturn = "";
					
					foreach ($Match[0] as $MatchKey => $MatchValue) {
					
						$ResultToReturn .= $MatchValue;
						
					}
					
					return $ResultToReturn;
					
					break;
				
				
				case 2: 
				
					// Filter ID2: Primary 2, allowed: {english russian + - _ ! @ $ \ | / * = , . ; : ( ) num @}
					
					preg_match_all("/[a-zA-Z0-9., !@$*=:|\/%;¹()+++_+-]*/", $String, $Match);
					
					$ResultToReturn = "";
					
					foreach ($Match[0] as $MatchKey => $MatchValue) {
					
						$ResultToReturn .= $MatchValue;
						
					}
					
					return $ResultToReturn;
					
					break;
					
					
				case 10: 
				
					// Filter ID10: Primary 3, allowed: {num}
					
					preg_match_all("/[0-9]*/", $String, $Match);
					
					$ResultToReturn = "";
					
					foreach ($Match[0] as $MatchKey => $MatchValue) {
					
						$ResultToReturn .= $MatchValue;
						
					}
					
					return $ResultToReturn;
					
					break;
					
				
				case 3: 
				
					// Filter ID3: Base 1, allowed: {num en symbols except dangerous}
					
					preg_match_all("/[0-9A-Za-z.,!()@?%$=;:]*/", $String, $Match);
					
					$ResultToReturn = "";
					
					foreach ($Match[0] as $MatchKey => $MatchValue) {
					
						$ResultToReturn .= $MatchValue;
						
					}
					
					return $ResultToReturn;
					
					break;
				
				case 4: 
				
					// Filter ID4: Base 2, allowed: {num en ru symbols except dangerous}
					
					preg_match_all("/[0-9A-Za-zÀ-ßà-ÿ.,!()@?%$=;:]*/", $String, $Match);
					
					$ResultToReturn = "";
					
					foreach ($Match[0] as $MatchKey => $MatchValue) {
					
						$ResultToReturn .= $MatchValue;
						
					}
					
					return $ResultToReturn;
					
					break;
					
				case 5: 
				
					// Filter ID5: Base 3, allowed: {user}
					
					global $SLPublicMainConfig;
					
					preg_match_all( $SLPublicMainConfig["FILTERS"]["BASE3_ADVANCED_SETTINGS"], $String, $Match);
					
					$ResultToReturn = "";
					
					foreach ($Match[0] as $MatchKey => $MatchValue) {
					
						$ResultToReturn .= $MatchValue;
						
					}
					
					return $ResultToReturn;
					
					break;
					
					
				case 6: 
				
					// Filter ID6: HTML, allowed: {any except dangerous}
					
					$GetAllHTMLTags = explode( "<", $String );
					
					foreach( $GetAllHTMLTags as $Position => $Target ) {
					
						$Analyzer = explode( ">", $Target );
						
						if( strpos( " ".strtolower($Analyzer[0]), "script" ) 
						|| strpos( " ".strtolower($Analyzer[0]), "style" )
						|| strpos( " ".strtolower($Analyzer[0]), "iframe" )
						|| strpos( " ".strtolower($Analyzer[0]), "form" )
						|| strpos( " ".strtolower($Analyzer[0]), "input" )
						) {
						
							$String = str_replace( "<" . $Analyzer[0] . ">", "&lt;" . $Analyzer[0] . "&gt;", $String );
						
						}
						
						
					
					}
					
					
					return $String;
					
					break;
					
				case 7: 
				
					// Filter ID6: HTML, allowed: {predefined by system only}
					
					$GetAllHTMLTags = explode( "<", $String );
					
					$AllowedHTMLTags[0] = array (
					
						 "b", "strong", "i", "u", "s", "em", "h1",
						 
						 "h2", "h3", "h4", "h5", "h6", "br", "br",
						 
						 "hr", "pre", "sub", "sup", "p", "div"
					
					);
					
					$AllowedHTMLTags[1] = array (
					
						 "a" => array( "href", "title", "style" ),

						 "img" => array( "src", "alt", "title", "style" )
					
					);
					
					foreach( $GetAllHTMLTags as $Position => $Target ) {
					
						$Analyzer = explode( ">", $Target );
						
						$Replacer[0] = array (
						
						" " => null,
						
						"/" => null
						
						);
						
						$Replacer[1] = array (
						
						"/" => null
						
						);
						
						# Incomung analyze, step one of seven: basic HTML tags without any additional formatting
						
						if( ! in_array ( strtr(strtolower($Analyzer[0]), $Replacer[0]), $AllowedHTMLTags[0] ) ) {
						
							# Step two of seven
							
							$PreparingForStep2[0] = explode( "\"", strtr(strtolower($Analyzer[0]), $Replacer[1]) );
							
							foreach ( $PreparingForStep2[0] as $PositionID => $SlashesValue ) {
							
								
							
							}
							
							$PreparingForStep2 = explode( " ",  strtr(strtolower($Analyzer[0]), $Replacer[1]) );
							
							if( array_key_exists( $PreparingForStep2[0], $AllowedHTMLTags[1] ) ) {
							
								foreach( $PreparingForStep2 as $PositionID => $Tag ) {}
							
							}
							
							$String = str_replace( "<" . $Analyzer[0] . ">", "&lt;" . $Analyzer[0] . "&gt;", $String );
						
						}
						
						
					
					}
					
					
					return $String;
					
					break;
					
				}
		
	}
 }
  
	 ?>