PHP移除指定HTML标签方法总结

strip_tags($source, ”); 去掉所以的html标签。
strip_tags($source, ‘<div><img><em>’); 保留字符串中的div、img、em标签。

function strip_only_tags($str, $tags, $stripContent = FALSE) {
  $content = '';
 
  if (!is_array($tags)) {
    $tags = (strpos($str, '>') !== false ? explode('>', str_replace('<', '', $tags)) : array($tags));
    if (end($tags) == '') {
      array_pop($tags);
    }
  }
 
  foreach($tags as $tag) {
    if ($stripContent) {
      $content = '(.+<!--'.$tag.'(-->|s[^>]*>)|)';
    }
 
    $str = preg_replace('#<!--?'.$tag.'(-->|s[^>]*>)'.$content.'#is', '', $str);
  }
 
  return $str;
}

$target = strip_only_tags($source, array(‘a’,'em’,'b’));移除$source字符串内的a、em、b标签。

$source='<div><a href="" target="_blank"><img" width=100% src="logo.png" border="0" alt="Welcome to linzl." />This a example from<em>lixiphp</em></a><strong>!</strong></div>
 ';
 
$target = strip_only_tags($source, array('a','em'));
 
//target results
//<div><img" width=100% src="/logo.png" border="0" alt="Welcome to lixiphp." />This a example from<strong>!</strong></div>

<?php
//取出br标记
function strip($str)
{
$str=str_replace("<br>","",$str);
//$str=htmlspecialchars($str);
return strip_tags($str);
}
?>

date_default_timezone_set('PRC');

<?php
    date_default_timezone_set("Asia/Shanghain"); //设置时区为上海
?>

或者 设置东京的时区代码为：

<?php
    date_default_timezone_set("Asia/Tokyo");
?>

系统初始化时，加上

ini_set('date.timezone','Asia/Shanghai'); 

或

date_default_timezone_set("PRC"); 

<?  
date_default_timezone_set('PRC');  
echo date('Y-m-d H:i:s');  
?> 

$str=preg_replace('/abc/','abc',$str,1);
echo $str;

function show_email_2($string){
        $first = strpos($string, '@');
        //var_dump($first);
        if($first==1){
            $string = '****'.$string;
        }
        if($first>1 && $first<=5){
            $string = substr_replace($string,'****',0,$first-1);           
        }
        if($first>5){
            $string = substr_replace($string,'****',$first-5,4);
        }
       
        var_dump($string);
        return $string;
    }
    //show_email_2('22@163.com');        //输出-->****2@163.com
    //show_email_2('22@22.com');        //输出-->****2@22.com
    show_email_2('6123456@163.com');    //输出-->61****6@163.com

有没有不用正则的，嗯可以这样

$replace='xyz';
if(($position=strpos($str,$replace))!==false){
     $leng=strlen($replace);
    $str=substr_replace($str,'abc',$position,$leng);
}
echo $str;

<?php
/*
 * $text是输入的文本；
 * $word是原来的字符串；
 * $cword是需要替换成为的字符串；
 * $pos是指$word在$text中第N次出现的位置，从1开始算起
 * */
function changeNstr($text,$word,$cword,$pos=1){
$text_array=explode($word,$text);
$num=count($text_array)-1;
if($pos>$num){
return "the number is too big!or can not find the $word";
}
$result_str='';
for($i=0;$i<=$num;$i++){
if($i==$pos-1){
$result_str.=$text_array[$i].$cword;
}else{
$result_str.=$text_array[$i].$word;}

}

return rtrim($result_str,$word);
}
$text='hello world hello pig hello cat hello dog hello small boy';
$word='hello';
$cword='good-bye';
echo changeNstr($text,$word,$cword,3);
//输出：hello world hello pig good-bye cat hello dog hello small boy
?>

$binfo =array('Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; InfoPath.2; AskTbPTV/5.17.0.25589; Alexa Toolbar)','Mozilla/5.0 (Windows NT 5.1; rv:22.0) Gecko/20100101 Firefox/22.0','Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET4.0C; Alexa Toolbar)','Mozilla/4.0(compatible; MSIE 6.0; Windows NT 5.1; SV1)',$_SERVER['HTTP_USER_AGENT']);
//123.125.68.*
//125.90.88.*

$cip = '123.125.68.'.mt_rand(0,254);
$xip = '125.90.88.'.mt_rand(0,254);
$header = array(
'CLIENT-IP:'.$cip,
'X-FORWARDED-FOR:'.$xip,
);

function getimgs( $url,$userinfo,$header)
{
 $ch = curl_init();
 $timeout = 5;
 curl_setopt ($ch, CURLOPT_URL, "$url");
 curl_setopt ($ch, CURLOPT_HTTPHEADER, $header);
 curl_setopt ($ch, CURLOPT_REFERER, "http://www.baidu.com/");
 curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt ($ch, CURLOPT_USERAGENT, "$userinfo");
 curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout); 
 $contents = curl_exec($ch);
 curl_close($ch);
 return $contents;
}

function saveimgs( $handle )
{
 $fp = fopen('a.jpg',"w");
 fwrite($fp,$handle);
 unset($fp);
 unset($handle);
}

$url ='http://www.111cn.net/img/logo.jpg';
$u = $binfo[mt_rand(0,3)];
saveimgs(getimgs($url,$u,$header));