PHP-注意：未定义的偏移量：1 [重复]答案

【问题标题】：PHP- Notice: Undefined offset: 1 [duplicate]PHP-注意：未定义的偏移量：1 [重复]
【发布时间】：2020-01-22 09:31:33
【问题描述】：

我有这段代码可以将数字转换为单词。我在一个网站上找到了它（我不记得那个网站了）。该代码通常运行良好，但在十位为 1 或 0 的数字中会出现此错误：

Notice: Undefined offset: 1 in C:\xampp\htdocs\...\printreceipt.php on line 103.

小数点后的数字也不正确。我非常努力地修改代码来解决问题，但我还没有解决它。另外，我在 stakoverflow 中发现了一些标题相同的问题，但没有这样的代码，我试图从这些问题的答案中解决我的问题。

我的代码的一些结果：

154.000 = 一百五十四美元。

615.000 = 注意：未定义偏移量：1 in .. 650 美元/秒

545.152 = 545 美元/秒和 15 个已发送这是功能代码：

function numtowords($num){ 
$decones = array( 
            '01' => "One", 
            '02' => "Two", 
            '03' => "Three", 
            '04' => "Four", 
            '05' => "Five", 
            '06' => "Six", 
            '07' => "Seven", 
            '08' => "Eight", 
            '09' => "Nine", 
            10 => "Ten", 
            11 => "Eleven", 
            12 => "Twelve", 
            13 => "Thirteen", 
            14 => "Fourteen", 
            15 => "Fifteen", 
            16 => "Sixteen", 
            17 => "Seventeen", 
            18 => "Eighteen", 
            19 => "Nineteen" 
            );
$ones = array( 
            0 => " ",
            1 => "One",     
            2 => "Two", 
            3 => "Three", 
            4 => "Four", 
            5 => "Five", 
            6 => "Six", 
            7 => "Seven", 
            8 => "Eight", 
            9 => "Nine", 
            10 => "Ten", 
            11 => "Eleven", 
            12 => "Twelve", 
            13 => "Thirteen", 
            14 => "Fourteen", 
            15 => "Fifteen", 
            16 => "Sixteen", 
            17 => "Seventeen", 
            18 => "Eighteen", 
            19 => "Nineteen" 
            ); 
$tens = array( 
            0 => "",
            2 => "Twenty", 
            3 => "Thirty", 
            4 => "Forty", 
            5 => "Fifty", 
            6 => "Sixty", 
            7 => "Seventy", 
            8 => "Eighty", 
            9 => "Ninety" 
            ); 
$hundreds = array( 
            "Hundred", 
            "Thousand", 
            "Million", 
            "Billion", 
            "Trillion", 
            "Quadrillion" 
            ); //limit t quadrillion 
$num = number_format($num,2,".",","); 
$num_arr = explode(".",$num); 
$wholenum = $num_arr[0]; 
$decnum = $num_arr[1]; 
$whole_arr = array_reverse(explode(",",$wholenum)); 
krsort($whole_arr); 
$rettxt = ""; 
foreach($whole_arr as $key => $i){ 
    if($i < 20){ 
        $rettxt .= $ones[$i]; 
    }
    elseif($i < 100){ 
        $rettxt .= $tens[substr($i,0,1)]; 
        $rettxt .= " ".$ones[substr($i,1,1)]; 
    }
    else{ 
        $rettxt .= $ones[substr($i,0,1)]." ".$hundreds[0]; 
        $rettxt .= " ".$tens[substr($i,1,1)]; 
        $rettxt .= " ".$ones[substr($i,2,1)]; 
    } 
    if($key > 0){ 
        $rettxt .= " ".$hundreds[$key]." "; 
    } 

} 
$rettxt = $rettxt." Dollar/s";

if($decnum > 0){ 
    $rettxt .= " and "; 
    if($decnum < 20){ 
        $rettxt .= $decones[$decnum]; 
    }
    elseif($decnum < 100){ 
        $rettxt .= $tens[substr($decnum,0,1)]; 
        $rettxt .= " ".$ones[substr($decnum,1,1)]; 
    }
    $rettxt = $rettxt." Sent"; 
} 
return $rettxt;
}

十位1和0的误差在以下部分：

else{ 
        $rettxt .= $ones[substr($i,0,1)]." ".$hundreds[0]; 
        $rettxt .= " ".$tens[substr($i,1,1)]; 
        $rettxt .= " ".$ones[substr($i,2,1)]; 
    }

我认为并且我不确定，小数的错误在以下几行中：

if($decnum > 0){ 
    $rettxt .= " and "; 
    if($decnum < 20){ 
        $rettxt .= $decones[$decnum]; 
    }
    elseif($decnum < 100){ 
        $rettxt .= $tens[substr($decnum,0,1)]; 
        $rettxt .= " ".$ones[substr($decnum,1,1)]; 
    }
    $rettxt = $rettxt." Sent"; 
}

【问题讨论】：

除非你真的想花时间修复这个有缺陷的代码来学习，否则我建议你使用更强大的东西，比如现有的 php NumberFormatter class => $f = new NumberFormatter("en-US", NumberFormatter::SPELLOUT); echo $f->format(615.000);
您的问题是您将 615 拆分为 6、1、5。然后您将 6 用作百位，将 1 用作十位，但您没有以十位定义 1。你应该做的是检查 10 和小于 20 的，然后 make 是一个。或者只是按照上面的建议，numberformatter，它会解决你所有的问题

标签： php undefined offset notice

【解决方案1】：

foreach ($whole_arr as $key => $i) {
    if ($i < 20) {
        $rettxt .= $ones[$i];
    } elseif ($i < 100) {
        $rettxt .= $tens[substr($i, 0, 1)];
        $rettxt .= " " . $ones[substr($i, 1, 1)];
    } else {
        $rettxt .= $ones[substr($i, 0, 1)] . " " . $hundreds[0]; //fix here
        if(substr($i, 1, 1) != 1){
            $rettxt .= " " . $tens[substr($i, 1, 1)];
            $rettxt .= " " . $ones[substr($i, 2, 1)];
        }
        else{
            $rettxt .= " " . $ones[substr($i, 0, 1)+9];
        }

    }
    if ($key > 0) {
        $rettxt .= " " . $hundreds[$key] . " ";
    }
}

【讨论】：