PHP source code analysis: DZX1.5 string truncation function cutstr usage, dzx1.5cutstr_PHP tutorial

Usage of DZX1.5 string truncation function cutstr in php source code analysis, dzx1.5cutstr

This article describes the usage of DZX1.5 string truncation function cutstr in php source code analysis. Share it with everyone for your reference. The specific analysis is as follows:

<&#63;php 
/**
 * 函数来源DZX1.5，文件所在 /source/function/function_core.php
 */
define('CHARSET','UTF-8');
function cutstr($string, $length, $dot="...") {
  if(strlen($string)<=$length) {
    return $string;
  }
  if(strtolower(CHARSET) == "utf-8") {
    $n = $tn = $noc = 0;
    while($n < strlen($string)) {
      $t = ord($string[$n]);
      if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
        $tn = 1; $n++; $noc++;
      } elseif(194 <= $t && $t <= 223) {
        $tn = 2; $n += 2; $noc += 2;
      } elseif(224 <= $t && $t <= 239) {
        $tn = 3; $n += 3; $noc += 2;
      } elseif(240 <= $t && $t <= 247) {
        $tn = 4; $n += 4; $noc += 2;
      } elseif(248 <= $t && $t <= 251) {
        $tn = 5; $n += 5; $noc += 2;
      } elseif($t == 252 || $t == 253) {
        $tn = 6; $n += 6; $noc += 2;
      } else {
        $n++;
      }
      if($noc >= $length) {
        break;
      }
    }
    if($noc > $length) {
      $n -= $tn;
    }
    $strcut = substr($string, 0, $n);
  } else {
    for($i = 0; $i < $length; $i++) {
      $strcut .= ord($string[$i])>127 &#63; $string[$i].$string[++$i] : $string[$i];
    }
  }
  $pos = strrpos($strcut, chr(1));
  if($pos !== false) {
    $strcut = substr($strcut,0,$pos);
  }
  return $strcut.$dot;
}
$string = '测试数据库ablci102020@(#)!)!测试劳动力ddk';
echo cutstr($string,15);
/*End of php*/

The running results are as follows:

Test database ablci1020...

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

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