check the string contains big5 charactor

withBig5.php

    function withBig5($arg_strContent)  
    {  
        $blnEnglishOnly= true;  
        $intLoopCount = 0;  
        $intContentLength = strlen($arg_strContent);  
        while ($intLoopCount < $intContentLength)  
        {  
            $chrSingle = substr($arg_strContent,$intLoopCount,1);      
            if(ord($chrSingle) > 0x80)   
            {      
                $chrSingle = substr($arg_strContent,$intLoopCount,2);              
                $intLoopCount++;      
                if(isBig5($chrSingle))  
                {  
                    $blnEnglishOnly = false;  
                    break;  
                }              
            }  
            $intLoopCount++;          
        }        
        return !$blnEnglishOnly;  
    }  
         
    function isBig5($char="")  
    {  
        $bc  = hexdec(bin2hex($char));  
        if(($bc>=0xa440 && $bc<= 0xc67e)||($bc>=0xc940 && $bc<= 0xf9dc))  
        {  
            return true;  
        }  
        else  
        {  
            return false;  
        }  
    }