[PHP知识库]编程干货 | PHP 超有用的小方法

1. 判断字符串是否含有中文

//判断字符串是否为中文 TRUE：全是中文 2：含有中文 FALSE：没有包含中文

function string_is_chinese($str = '中文'){
        if (preg_match('/^[\x{4e00}-\x{9fa5}]+$/u', $str)>0) {
            $res = TRUE;
        } else if(preg_match('/[\x{4e00}-\x{9fa5}]/u', $str)>0) {
            $res = 2;
        } else {
            $res = FALSE;
        }
        return $res;
    }

2. PHP处理中文Unicode转码?

中文转unicode

 function unicode_encode($str, $encoding = 'UTF-8', $prefix = '&#', $postfix = ';'){
        if (is_array($str)) $str = implode(',',$str);
        $str = iconv($encoding, 'UCS-2BE', $str);
        $arrstr = str_split($str, 2);
        $unistr = '';
        for($i = 0, $len = count($arrstr); $i < $len; $i++) {
            $dec = hexdec(bin2hex($arrstr[$i]));
            $unistr .= $prefix . $dec . $postfix;
        }
        return $unistr;
    }



解码

function decode($str, $prefix="&#") {
    $a = explode(";", $str);
    $utf='';
    foreach ($a as $dec_old) {
        if($dec_old != ''){
            $ys=explode($prefix,$dec_old);
            if(count($ys)>1){
                if($ys[0]!=''){
                    $utf .= $ys[0];
                    $dec=$ys[1];
                }else{
                    $dec=$ys[1];
                }
            }else{
                $utf .= $ys[0];
                $dec = $ys[0];
            }
            if ($dec < 128) {
                $utf .= chr($dec);
            } else if ($dec < 2048) {
                $utf .= chr(192 + (($dec - ($dec % 64)) / 64));
                $utf .= chr(128 + ($dec % 64));
            } else {
                $utf .= chr(224 + (($dec - ($dec % 4096)) / 4096));
                $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
                $utf .= chr(128 + ($dec % 64));
            }
        }
    }
    return $utf;
}

?3. 生成随机密码

function generatePassword($length = 10)
{
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $result=substr(str_shuffle($characters),0,$length);
    return $result;
}

?4. 生成UUID随机字符串

function getActivationCode()
{
    mt_srand((double)microtime() * 10000);
    $charid = strtoupper(md5(uniqid(rand(), true)));
    $hyphen = chr(45);
    $uuid = substr($charid, 0, 8) . $hyphen
        . substr($charid, 8, 4) . $hyphen
        . substr($charid, 12, 4) . $hyphen
        . substr($charid, 16, 4) . $hyphen
        . substr($charid, 20, 12);

    return $uuid;
}

?5. 长sql语句换行等处理

function sqlClean($sql)
    {
        $sql = str_replace(array("/r/n", "\r\n", "/r", "/n", "\n"), '', $sql);
        return $sql;
    }

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