几个值得放在common中的函数

几个值得放在common.php中的函数

<?php
//纯文本输出 适合input
function t($text){
$text = h($text);
$text = strip_tags($text);
return $text;
}
//多行纯文本 适合textarea
function text($text)
{
    return trim(nl2br(str_replace(' ', ' ', htmlspecialchars($text))));
}
//将html换行变成回车
function br2nl($text)
{
   return trim(preg_replace('/<br\\s*\/?'.'>/i', '', $text));
}
//输出安全的html
function h($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
$text = preg_replace('/\r?\n/','',$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','[\1\2]',$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]+)[^><\[\]]*>[^><]*<\/\1>/i',$text,$mat)){
$text=str_replace($mat[0],str_replace('>',']',str_replace('<','[',$mat[0])),$text);
}
//转换引号
while(preg_match('/(\[[^\[\]]*=\s*)(\"|\')([^\2=\[\]]+)\2([^\[\]]*\])/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 $text;
}
//过滤脚本代码
function cleanJs($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 $text;
}
//在编辑器中显示纯文本
function et($text)
{
return trim(br2nl(str_replace(' ', ' ', $text )));
}
//在html编辑器中显示html
function eh($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);
}
}
?>