PHP implements filtering Chinese and numeric examples in strings_php skills

The example in this article describes the PHP implementation of filtering Chinese characters and numbers in strings. Share it with everyone for your reference. The specific implementation method is as follows:

function getChinese($string,$encode="GBK") {
  switch($encode){
   case "GBK" :$codelength=2;break;
   case "GB2312" :$codelength=3;break;
   case "UTF-8" :$codelength=3;break;
   case "UTF-16" :$codelength=4;break;
  }
  $tmpstr = '';
  $arr = array(1,2,3,4,5,6,7,8,9,0);
  $strlen = strlen($string);
  for($i=0; $i<$strlen; $i++) {
   $str=substr($string, $i, 1);
   $str1=trim($str);
   if( ord($str)>0xA0 ){
   $tmpstr.= substr($string, $i, $codelength);
   $i = $i+$codelength-1;
   }
  }
 return $tmpstr;
}

I hope this article will be helpful to everyone’s PHP programming design.