阿拉伯数字转为中文数字（1-1亿范围）123=>一百二十三）

function numToWord($num){
    $chiNum = array('零', '一', '二', '三', '四', '五', '六', '七', '八', '九');
    $chiUni = array('','十', '百', '千', '万', '亿', '十', '百', '千');
    $chiStr = '';
    $num_str = (string)$num;
    $count = strlen($num_str);
    $last_flag = true; //上一个 是否为0
    $zero_flag = true; //是否第一个
    $temp_num = null; //临时数字
    $chiStr = '';//拼接结果
    if ($count == 2) {//两位数
        $temp_num = $num_str[0];
        $chiStr = $temp_num == 1 ? $chiUni[1] : $chiNum[$temp_num].$chiUni[1];
        $temp_num = $num_str[1];
        $chiStr .= $temp_num == 0 ? '' : $chiNum[$temp_num]; 
    }else if($count > 2){
        $index = 0;
        for ($i=$count-1; $i >= 0 ; $i--) { 
                $temp_num = $num_str[$i];
                if ($temp_num == 0) {
                    if (!$zero_flag && !$last_flag ) {
                        $chiStr = $chiNum[$temp_num]. $chiStr;
                        $last_flag = true;
                    }
                }else{
                    $chiStr = $chiNum[$temp_num].$chiUni[$index%9] .$chiStr;
                    $zero_flag = false;
                    $last_flag = false;
                }
                $index ++;
        }
    }else{
        $chiStr = $chiNum[$num_str[0]]; 
    }
    return $chiStr;
}

把中文数字转为阿拉伯数字

function cn2num($string){

    if(is_numeric($string)){
        return $string;
    }
    // '仟' => '千','佰' => '百','拾' => '十',
    $string = str_replace('仟', '千', $string);
    $string = str_replace('佰', '百', $string);
    $string = str_replace('拾', '十', $string);
    $num = 0;
    $wan = explode('万', $string);
    if (count($wan) > 1) {
        $num += cn2num($wan[0]) * 10000;
        $string = $wan[1];
    }
    $qian = explode('千', $string);
    if (count($qian) > 1) {
        $num += cn2num($qian[0]) * 1000;
        $string = $qian[1];
    }
    $bai = explode('百', $string);
    if (count($bai) > 1) {
        $num += cn2num($bai[0]) * 100;
        $string = $bai[1];
    }
    $shi = explode('十', $string);
    if (count($shi) > 1) {
        $num += cn2num($shi[0] ? $shi[0] : '一') * 10;
        $string = $shi[1] ? $shi[1] : '零';
    }
    $ling = explode('零', $string);
    if (count($ling) > 1) {
        $string = $ling[1];
    }
    $d = array(
        '一' => '1','二' => '2','三' => '3','四' => '4','五' => '5','六' => '6','七' => '7','八' => '8','九' => '9',
        '壹' => '1','贰' => '2','叁' => '3','肆' => '4','伍' => '5','陆' => '6','柒' => '7','捌' => '8','玖' => '9',
        '零' => 0, '0' => 0, 'O' => 0, 'o' => 0,
        '两' => 2
    );
    return $num + @$d[$string];
}