$crud = array('中国|||我国|||大地', 'kelon|||lerke|||sb', 'sesscxx');
$crud = join('|',$crud);
$crud = str_replace('|||', '|', $crud);
$pat  = "/({$crud})/i";
$txt = '我知道中国你是sdfex谁！！';
preg_match/*_all*/($pat, $txt, $matches);
var_dump($matches);

function checkcrud($str, $crud)
{
    if(is_array($crud) && !emptyempty($crud))
    {
        foreach($crud as $value)
        {
            if(strpos($value, '|||') !== false)
            {
                $cruds = explode('|||', $value);
                $num = count($cruds);
                $check = 0;
                foreach($cruds as $val)
                {
                    if(strpos($str, $val) !== false)
                    {
                        $check++;
                    }
                }
                if($check == $num)
                {
                    return true;
                }
            }
            else
            {
                if(strpos($str, $value) !== false)
                {
                    return true;
                }
            }
        }
        return false;
    }
}
$crud = array('中国|||我国|||大地', 'kelon|||lerke|||ssxb', 'aaa');
$test1 = '我是中国人.我国人很多.大地上全是人.-__-!!好xx的造句.';
 
var_dump(checkcrud($test1, $crud));

function lktest($v,$keyword){
foreach ($v as $k){
if (strpos($k,"|||")!==false){
    $kelon=explode("|||",$k);
    //求数组最大值
    $b=count($kelon);
    foreach($kelon as $t){
        //echo $t.'<br>';
        if (preg_match('/'.$t.'/i',$keyword)){ 
            //echo "敏感关键字";
            $a=$a+1;           
        }
    else{    
    $a='';
    }
            
    }
    //如果数组最大值跟$a相等时，则所有|||关键字都出现了
    if ($a==$b){
        echo "敏感关键字";    
        }
   }
elseif(preg_match('/'.$k.'/i',$keyword)){
echo "敏感关键字";
    } 
}
}