php 去除重复的字符串程序代码

echo preg_replace("/([^s]+)*\1{2,}([^s]+)*/",'',$string);

$str = 'abccba 9872223s 12121212 ddd 1234560 vbwwc asasasasas zxzx qaz';
$source_array = explode(" ", $str);
foreach($source_array as $key=>$item){
    $current_str = str_split($item, 1);
    $current_array=array_count_values($current_str);    
    foreach ($current_array as $k => $it){
            if($it>=3)
                unset($source_array[$key]);
    }
}
var_dump($source_array);

<?php
$str = '蚂蚁蚂蚁学院学院，我非常爱爱爱爱爱你!522200011111333311111444';
function mbstringtoarray($str,$charset) {
  $strlen=mb_strlen($str);
  while($strlen){
    $array[]=mb_substr($str,0,1,$charset);
    $str=mb_substr($str,1,$strlen,$charset);
    $strlen=mb_strlen($str);
  }
  return $array;
}
$arr = mbstringtoarray($str,"gbk");  //分割字符串
$arr = array_unique($arr);           //过滤重复字符
$str = implode('', $arr);            //合并数组
echo $str;
?>

echo preg_replace('/([^s]+)/e','check("\1")',$string); 
function check($str) { 
       $tmp=count_chars($str,1); 
       sort($tmp); 
       return array_pop($tmp)>2?"":$str; 
 }

<?php
$path = "images";
if(!rmdir($path))
  {
  echo ("Could not remove $path");
  }
else
{
 echo '删除目录失败，因为images非空目录';
}
?>

<?php
// 说明： 删除非空目录的解决方案

function removeDir($dirName)
{
    if(! is_dir($dirName))
    {
        return false;
    }
    $handle = @opendir($dirName);
    while(($file = @readdir($handle)) !== false)
    {
        if($file != '.' && $file != '..')
        {
            $dir = $dirName . '/' . $file;
            is_dir($dir) ? removeDir($dir) : @unlink($dir);
        }
    }
    closedir($handle);
     
    return rmdir($dirName) ;
}
?>

$uAgent = $_SERVER['HTTP_USER_AGENT'];

$osPat = "mozilla|m3gate|winwap|openwave|Windows NT|Windows 3.1|95|Blackcomb|98|ME|X Window|ubuntu|Longhorn|AIX|Linux|AmigaOS|BEOS|HP-UX|OpenBSD|FreeBSD|NetBSD|OS/2|OSF1|SUN";

if(preg_match("/($osPat)/i", $uAgent )) //winwap 模拟WAP手机上网的一个浏览器; openwave|后面为各pc操作系统

{

echo "电脑访问";

}

else

{

echo "手机访问";

}

echo '<br/>'.$uAgent;

$ua = strtolower($_SERVER['HTTP_USER_AGENT']);

$uachar = "/(nokia|sony|ericsson|mot|samsung|sgh|lg|philips|panasonic|alcatel|lenovo|cldc|midp|mobile|wap)/i";

if(($ua == '' || preg_match($uachar, $ua))&& !strpos(strtolower($_SERVER['REQUEST_URI']),'wap'))
{
    $Loaction = 'wap/';

    if (!empty($Loaction))
    {
        ecs_header("Location: $Loactionn");

        exit;
    }

}

/** 
* 自定义 header 函数，用于过滤可能出现的安全隐患 
* 
* @param   string  string  内容 
* 
* @return  void 
**/ 
function ecs_header($string, $replace = true, $http_response_code = 0)  
{  
    if (strpos($string, '../upgrade/index.php') === 0)  
    {  
        echo '<script type="text/javascript">window.location.href="' . $string . '";</script>';  
    }  
    $string = str_replace(array("r", "n"), array('', ''), $string);  
 
    if (preg_match('/^s*location:/is', $string))  
    {  
        @header($string . "n", $replace);  
 
        exit();  
    }  
 
    if (emptyempty($http_response_code) || PHP_VERSION < '4.3')  
    {  
        @header($string, $replace);  
    }  
    else 
    {  
        @header($string, $replace, $http_response_code);  
    }  
} 

if(navigator.platform.indexOf('Win32')!=-1){
//go to pc
}else{
// go to 手机
}

$outputs=array();

exec("zip ./Exl_file/wow.zip ./Exl_file/wow_1.txt ./Exl_file/wow_2.txt ./Exl_file/wow_3.txt",$outputs,$rc);

if($rc!=0){
    foreach ($outputs as $ko=>$vo){
        echo "$vo<br/>";
    }
}else{
    $zipfile='./Exl_file/wow.zip';
       
    //文件下载  输出后删除相关文件
    }
}