Detailed explanation of the judgment and interception examples of mixed Chinese and English string lengths in PHP

This article mainly introduces PHP's length judgment and interception methods for mixed Chinese and English strings , and analyzes the traversal , conversion, and interception of Chinese and English strings in PHP in the form of examples. , calculation and other related operating skills, friends in need can refer to the following

This article describes the PHP method for length judgment and interception of mixed Chinese and English strings. Share it with everyone for your reference, the details are as follows:

/**
 * 
 * 中英混合字符串长度判断 
 * @param unknown_type $str
 * @param unknown_type $charset
 */
function strLength($str, $charset = 'utf-8') {
  if ($charset == 'utf-8')
    $str = iconv ( 'utf-8', 'gb2312', $str );
  $num = strlen ( $str );
  $cnNum = 0;
  for($i = 0; $i < $num; $i ++) {
    if (ord ( substr ( $str, $i + 1, 1 ) ) > 127) {
      $cnNum ++;
      $i ++;
    }
  }
  $enNum = $num - ($cnNum * 2);
  $number = ($enNum / 2) + $cnNum;
  return ceil ( $number );
}

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