收藏一些规范化输入输出的PHP函数_PHP教程

function t($text){
	$text = h($text);
	$text = strip_tags($text);
	return $text;
}

function text($text)
{
    return trim(nl2br(str_replace(' ', ' ', htmlspecialchars($text))));
}

function br2nl($text)
{
   	return trim(preg_replace('/<br\s*/?'.'>/i', '', $text));
}

function h($text){
	$text = trim($text);
	$text = stripslashes($text);
	//完全过滤注释
	$text = preg_replace('/<!--?.*-->/','',$text);
	//完全过滤动态代码
	$text = preg_replace('/<?|?'.'>/','',$text);
	//完全过滤js
	$text = preg_replace('/<script?.*/script>/','',$text);
	$text = str_replace('[','[',$text);
	$text = str_replace(']',']',$text);
	$text = str_replace('|','|',$text);
	//过滤换行符
	$text = preg_replace('/
?
/','',$text);
	//br
	$text = preg_replace('/<br(s/)?'.'>/i','[br]',$text);
	$text = preg_replace('/([br]s*){10,}/i','[br]',$text);
	//hr img area input
	$text = preg_replace('/<(hr|img|input|area|isindex)( [^><[]]*)>/i','[
]',$text);
	//过滤多余html
	$text = preg_replace('/</?(html|head|meta|link|base|body|title|style|script|form|iframe|frame|frameset)[^><]*>/i','',$text);
	//过滤on事件lang js
	while(preg_match('/(<[^><]+)( lang|onfinish|onmouse|onexit|onerror|onclick|onkey|onload|onchange|onfocus|onblur)[^><]+/i',$text,$mat)){
		$text=str_replace($mat[0],$mat[1],$text);
	}
	while(preg_match('/(<[^><]+)(window.|javascript:|js:|about:|file:|document.|vbs:|cookie)([^><]*)/i',$text,$mat)){
		$text=str_replace($mat[0],$mat[1].$mat[3],$text);
	}
	//过滤合法的html标签
	while(preg_match('/<([a-z]+)[^><[]]*>[^><]*</
>/i',$text,$mat)){
		$text=str_replace($mat[0],str_replace('>',']',str_replace('<','[',$mat[0])),$text);
	}
	//转换引号
	while(preg_match('/([[^[]]*=s*)("|')([^=[]]+)([^[]]*])/i',$text,$mat)){
		$text=str_replace($mat[0],$mat[1].'|'.$mat[3].'|'.$mat[4],$text);
	}
	//过滤错误的单个引号
	while(preg_match('/[[^[]]*("|')[^[]]*]/i',$text,$mat)){
		$text=str_replace($mat[0],str_replace($mat[1],'',$mat[0]),$text);
	}
	//转换其它所有不合法的 < >
	$text = str_replace('<','<',$text);
	$text = str_replace('>','>',$text);
	$text = str_replace('"','"',$text);
	//反转换
	$text = str_replace('[','<',$text);
	$text = str_replace(']','>',$text);
	$text = str_replace('|','"',$text);
	//过滤多余空格
	$text = str_replace(' ',' ',$text);
	return $text;
}

function cleanJs($text){
	$text = trim($text);
	$text = stripslashes($text);
	//完全过滤动态代码
	$text = preg_replace('/<?|?'.'>/','',$text);
	//完全过滤js
	$text = preg_replace('/<script?.*/script>/','',$text);
	//过滤多余html
	$text = preg_replace('/</?(html|head|meta|link|base|body|title|style|script|form|iframe|frame|frameset)[^><]*>/i','',$text);
	//过滤on事件lang js
	while(preg_match('/(<[^><]+)(lang|onfinish|onmouse|onexit|onerror|onclick|onkey|onload|onchange|onfocus|onblur)[^><]+/i',$text,$mat)){
		$text=str_replace($mat[0],$mat[1],$text);
	}
	while(preg_match('/(<[^><]+)(window.|javascript:|js:|about:|file:|document.|vbs:|cookie)([^><]*)/i',$text,$mat)){
		$text=str_replace($mat[0],$mat[1].$mat[3],$text);
	}
	return $text;
}

function et($text)
{
	return trim(br2nl(str_replace(' ', ' ', $text )));
}

function eh($text)
{
	return trim(str_replace('"','"', $text));
}

function friendlyDate($sTime,$type = 'normal',$alt = 'false') {
	//sTime=源时间，cTime=当前时间，dTime=时间差
	$cTime = time();
	$dTime = $cTime - $sTime;
	$dDay = intval(date("Ymd",$cTime)) - intval(date("Ymd",$sTime));
	$dYear = intval(date("Y",$cTime)) - intval(date("Y",$sTime));
	//normal：n秒前，n分钟前，n小时前，日期
	if($type=='normal'){
		if( $dTime < 60 )
		{
   			echo $dTime."秒前";
		}
		elseif( $dTime < 3600 )
		{
   			echo intval($dTime/60)."分钟前";
		}
		elseif( $dTime >= 3600 && $dDay == 0 )
		{
   			echo intval($dTime/3600)."小时前";
		}
		elseif($dYear==0)
		{
   			echo date("m-d ,H:i",$sTime);
		}
		else
		{
   			echo date("Y-m-d ,H:i",$sTime);
		}
		//full: Y-m-d , H:i:s
	}
	elseif($type=='full')
	{
		echo date("Y-m-d , H:i:s",$sTime);
	}
}