//字符串截取 $a = "s@@你好"; var_dump(strlen_weibo($a,'utf-8')); 结果输出为8,其中字母s计数为1,全角@计数为2,半角@计数为1,两个中文计数为4。源码如下: //截取字符串的函数代码 function strlen_weibo($string, $charset='utf-8') { $n = $count = 0; $length = strlen($string); if (strtolower($charset) == 'utf-8') { while ($n { $currentByte = ord($string[$n]); if ($currentByte == 9 || $currentByte == 10 || (32 { $n++; $count++; } elseif (194 { $n += 2; $count += 2; } elseif (224 { $n += 3; $count += 2; } elseif (240 { $n += 4; $count += 2; } elseif (248 { $n += 5; $count += 2; } elseif ($currentByte == 252 || $currentByte == 253) { $n += 6; $count += 2; } else { $n++; $count++; } if ($count >= $length) { break; } } return $count; } else { for ($i = 0; $i { if (ord($string[$i]) > 127) { $i++; $count++; } $count++; } return $count; } } 复制代码