PHP determines whether a string is pure English, pure Chinese characters, or a mixture of Chinese and English_PHP Tutorial

The following are some PHP examples I have collected to determine whether a string is pure English, pure Chinese characters or a mixture of Chinese and English. You can refer to it.

Pure English

The code is as follows

Copy code

代码如下	复制代码
if(preg_match("/^[a-z]*$/i",   "fdsFDfd"))  {   echo   "全字母   ";   }

if(preg_match("/^[a-z]*$/i", "fdsFDfd"))

{

代码如下	复制代码
比如： var str = "php编程"; if (/^[u4e00-u9fa5]+$/.test(str)) { alert("该字符串全部是中文"); } else{ alert("该字符串不全部是中文"); } php中，是用x表示十六进制数据的。于是，变换成如下的代码： $str = "php编程"; if (preg_match("/^[x4e00-x9fa5]+$/",$str)) { print("该字符串全部是中文"); } else { print("该字符串不全部是中文"); }

echo "Full letters

";

}

代码如下	复制代码
/^[a-z0-9_u4e00-u9fa5]+[^_]$/g utf-8下 preg_match("/^[a-z0-9_x80-xff]+[^_]$/g",$a);gbk下: preg_match("/^[a-z0-9_".chr(0xa1)."-".chr(0xff)."]+[^_]$/",$a)

Pure Chinese characters

The code is as follows

Copy code

For example:

代码如下	复制代码
/**  * PHP判断字符串纯汉字 OR 纯英文 OR 汉英混合  * 琼台博客  */ echo ''; function utf8_str($str){     $mb = mb_strlen($str,'utf-8');     $st = strlen($str);     if($st==$mb)         return '纯英文';     if($st%$mb==0 && $st%3==0)         return '纯汉字';     return '汉英混合'; }   $str = '琼台博客'; echo '字符串：'.$str.'，是'.utf8_str($str).''; ?>

var str = "php programming";

if (/^[u4e00-u9fa5]+$/.test(str)) {

alert("The string is all in Chinese");

代码如下	复制代码
function gbk_str($str){     $mb = mb_strlen($str,'gbk');     $st = strlen($str);     if($st==$mb)         return '纯英文';     if($st%$mb==0 && $st%2==0)         return '纯汉字';     return '汉英混合'; }

} else{ alert("This string is not all in Chinese"); } In php, x is used to represent hexadecimal data. So, transform it into the following code: $str = "php programming"; if (preg_match("/^[x4e00-x9fa5]+$/",$str)) { print("This string is all in Chinese"); } else { print("This string is not all Chinese"); }

Mixed Chinese and English Username: includes English lowercase, Chinese characters, numbers, and underscores. It cannot all be numbers. The underscore cannot be at the end

The code is as follows	Copy code
/^[a-z0-9_u4e00-u9fa5]+[^_]$/g utf-8 preg_match("/^[a-z0-9_x80-xff]+[^_]$/g",$a); under gbk: preg_match("/^[a-z0-9_".chr(0xa1)."-".chr(0xff)."]+[^_]$/",$a)

utf-8 encoding

The code is as follows

Copy code

/** * PHP determines whether the string is pure Chinese characters OR pure English OR mixed Chinese and English * Qiongtai Blog ​*/ echo ''; function utf8_str($str){ $mb = mb_strlen($str,'utf-8'); $st = strlen($str); If($st==$mb)           return 'Pure English'; If($st%$mb==0 && $st%3==0)           return 'Pure Chinese characters'; Return 'Chinese-English mix'; } $str = 'Qiongtai Blog'; echo 'String: '.$str.', is '.utf8_str($str). ''; ?>

gbk encoding

The code is as follows	Copy code
function gbk_str($str){ $mb = mb_strlen($str,'gbk'); $st = strlen($str); If($st==$mb)           return 'Pure English'; If($st%$mb==0 && $st%2==0)           return 'Pure Chinese characters'; Return 'Chinese-English mix'; }

Numerical Chinese characters

The code is as follows

代码如下	复制代码
$username=$_REQUEST['username']; if(!preg_match("/^[a-z0-9xa1-xff]{3,10}$/",$username))  {   echo"34r345";   exit;  }

Copy code

$username=$_REQUEST['username'];
if(!preg_match("/^[a-z0-9xa1-xff]{3,10}$/",$username))
{
echo "34r345";
exit;
}

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TechArticle

The following are some PHP examples I collected to determine whether a string is pure English, pure Chinese characters or a mixture of Chinese and English. You can refer to. The pure English code is as follows. Copy the code if(preg_match(/^[a-z]*$/i, fdsFD...