在 PHP 开发中经常会用到将数字从阿拉伯数字转成中文数字的功能，比如订单金额大写展示、发票金额打印等等。虽然可以使用一些在线工具或者手动转换的方法，但是这些方法存在一些问题，如效率较低、数字转换规则不受控制、容易出现错误等等。因此，开发一个 PHP 函数来实现中文数字转换功能是非常必要的。在本文中，我们将介绍一个简单实用的 PHP 函数，并对其实现原理进行解析。
首先，我们需要明确的是，中文数字的转换规则与阿拉伯数字有很大区别。阿拉伯数字是十进制系统，而中文数字是以万为进位的。此外，中文数字还存在一些特殊的规则，比如零的使用、数字一的特殊读法等等。
以下是阿拉伯数字 0-9 对应的中文数字：
0 -> 零 1 -> 一 2 -> 二 3 -> 三 4 -> 四 5 -> 五 6 -> 六 7 -> 七 8 -> 八 9 -> 九
接下来是 10-99 对应的中文数字：
10 -> 十 20 -> 二十 30 -> 三十 ... 90 -> 九十
在以上规则的基础上，我们可以继续扩展：
100 -> 一百 1000 -> 一千 10000 -> 一万 100000000 -> 一亿
当然，这些规则并不是绝对的，特别是数字一在读法上还存在一些特殊情况，比如读做“壹”、“弌”、“什”等等，这些情况我们在实现中会特殊处理。
接下来，我们就开始逐步实现这个中文数字的转换函数。我们将函数命名为convert_number_to_chinese，该函数使用一个参数表示需要转换的数字，返回值为转换后的中文数字字符串。
首先是实现数字 0-9 的转换，非常简单：
function convert_number_to_chinese($number) { $chinese_numbers = array( "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" ); return $chinese_numbers[$number]; }
接下来是数字 10-99 的转换：
function convert_number_to_chinese($number) { $chinese_numbers = array( "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" ); if ($number < 10) { return $chinese_numbers[$number]; } else if ($number < 20) { return "十" . $chinese_numbers[$number - 10]; } else { $ten = $number / 10; $digit = $number % 10; if ($digit == 0) { return $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } }
上面的代码通过数学运算将数字拆分为十位和个位，然后根据规则进行拼接后返回结果。
接下来是 100-999 数字的转换：
function convert_number_to_chinese($number) { $chinese_numbers = array( "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" ); if ($number < 10) { return $chinese_numbers[$number]; } else if ($number < 20) { return "十" . $chinese_numbers[$number - 10]; } else if ($number < 100) { $ten = $number / 10; $digit = $number % 10; if ($digit == 0) { return $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else { $hundred = $number / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($ten == 0 && $digit == 0) { return $chinese_numbers[$hundred] . "百"; } else if ($ten == 0) { return $chinese_numbers[$hundred] . "百零" . $chinese_numbers[$digit]; } else if ($digit == 0) { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } }
上面的代码实现了 100-999 的转换，采用与 10-99 相同的拆分思路，先将数字拆分百位、十位和个位，然后根据规则进行拼接后返回结果。
接下来是 1000-9999 数字的转换：
function convert_number_to_chinese($number) { $chinese_numbers = array( "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" ); if ($number < 10) { return $chinese_numbers[$number]; } else if ($number < 20) { return "十" . $chinese_numbers[$number - 10]; } else if ($number < 100) { $ten = $number / 10; $digit = $number % 10; if ($digit == 0) { return $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else if ($number < 1000) { $hundred = $number / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($ten == 0 && $digit == 0) { return $chinese_numbers[$hundred] . "百"; } else if ($ten == 0) { return $chinese_numbers[$hundred] . "百零" . $chinese_numbers[$digit]; } else if ($digit == 0) { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else { $thousand = $number / 1000; $hundred = ($number % 1000) / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($hundred == 0 && $ten == 0 && $digit == 0) { return $chinese_numbers[$thousand] . "千"; } else if ($hundred == 0) { return $chinese_numbers[$thousand] . "千零" . convert_number_to_chinese(substr($number, 1)); } else { return $chinese_numbers[$thousand] . "千" . convert_number_to_chinese($number % 1000); } } }
上面的代码实现了 1000-9999 的转换，采用类似的拆分思路。需要注意的是，在处理千位数字时，需要递归调用convert_number_to_chinese函数，处理剩余的三位数。
接下来是 10000-99999999 数字的转换：
function convert_number_to_chinese($number) { $chinese_numbers = array( "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" ); if ($number < 10) { return $chinese_numbers[$number]; } else if ($number < 20) { return "十" . $chinese_numbers[$number - 10]; } else if ($number < 100) { $ten = $number / 10; $digit = $number % 10; if ($digit == 0) { return $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else if ($number < 1000) { $hundred = $number / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($ten == 0 && $digit == 0) { return $chinese_numbers[$hundred] . "百"; } else if ($ten == 0) { return $chinese_numbers[$hundred] . "百零" . $chinese_numbers[$digit]; } else if ($digit == 0) { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else if ($number < 10000) { $thousand = $number / 1000; $hundred = ($number % 1000) / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($hundred == 0 && $ten == 0 && $digit == 0) { return $chinese_numbers[$thousand] . "千"; } else if ($hundred == 0) { return $chinese_numbers[$thousand] . "千零" . convert_number_to_chinese(substr($number, 1)); } else { return $chinese_numbers[$thousand] . "千" . convert_number_to_chinese($number % 1000); } } else if ($number < 100000000) { $ten_thousand = $number / 10000; $thousand = ($number % 10000) / 1000; $hundred = ($number % 1000) / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($thousand == 0 && $hundred == 0 && $ten == 0 && $digit == 0) { return convert_number_to_chinese($ten_thousand) . "万"; } else if ($thousand == 0 && $hundred == 0 && $ten == 0) { return convert_number_to_chinese($ten_thousand) . "万零" . $chinese_numbers[$digit]; } else if ($thousand == 0 && $hundred == 0) { return convert_number_to_chinese($ten_thousand) . "万零" . convert_number_to_chinese($number % 100); } else if ($thousand == 0) { return convert_number_to_chinese($ten_thousand) . "万" . convert_number_to_chinese($number % 1000); } else { return convert_number_to_chinese($ten_thousand) . "万" . convert_number_to_chinese($number % 10000); } } }
上面的代码实现了 10000-99999999 的转换，用到了递归调用的思路。需要注意的是，在处理万位数字时，需要分别处理一万以下和一万以上的情况，避免出现重复的“万”字符。
最后，在函数开头加上以下代码，来处理数字为 0 的情况：
if ($number == 0) { return "零"; }
到此，我们的中文数字转换函数就完成了。以下是一个完整的示例：
function convert_number_to_chinese($number) { $chinese_numbers = array( "零", "一", "二", "三", "四", "五", "六", "七", "八", "九" ); if ($number == 0) { return "零"; } else if ($number < 10) { return $chinese_numbers[$number]; } else if ($number < 20) { return "十" . $chinese_numbers[$number - 10]; } else if ($number < 100) { $ten = $number / 10; $digit = $number % 10; if ($digit == 0) { return $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else if ($number < 1000) { $hundred = $number / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($ten == 0 && $digit == 0) { return $chinese_numbers[$hundred] . "百"; } else if ($ten == 0) { return $chinese_numbers[$hundred] . "百零" . $chinese_numbers[$digit]; } else if ($digit == 0) { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十"; } else { return $chinese_numbers[$hundred] . "百" . $chinese_numbers[$ten] . "十" . $chinese_numbers[$digit]; } } else if ($number < 10000) { $thousand = $number / 1000; $hundred = ($number % 1000) / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($hundred == 0 && $ten == 0 && $digit == 0) { return $chinese_numbers[$thousand] . "千"; } else if ($hundred == 0) { return $chinese_numbers[$thousand] . "千零" . convert_number_to_chinese(substr($number, 1)); } else { return $chinese_numbers[$thousand] . "千" . convert_number_to_chinese($number % 1000); } } else if ($number < 100000000) { $ten_thousand = $number / 10000; $thousand = ($number % 10000) / 1000; $hundred = ($number % 1000) / 100; $ten = ($number % 100) / 10; $digit = $number % 10; if ($thousand == 0 && $hundred == 0 && $ten == 0 && $digit == 0) { return convert_number_to_chinese($ten_thousand) . "万"; } else if ($thousand == 0 && $hundred == 0 && $ten == 0) { return convert_number_to_chinese($ten_thousand) . "万零" . $chinese_numbers[$digit]; } else if ($thousand == 0 && $hundred == 0) { return convert_number_to_chinese($ten_thousand) . "万零" . convert_number_to_chinese($number % 100); } else if ($thousand == 0) { return convert_number_to_chinese($ten_thousand) . "万" . convert_number_to_chinese($number % 1000); } else { return convert_number_to_chinese($ten_thousand) . "万" . convert_number_to_chinese($number % 10000); } } }
综上所述，在开发过程中，我们需要仔细理解中文数字的转换规则，并适时采用递归等算法进行实现。考虑到中文数字转换可能存在的复杂性，该函数实现可以作为一种参考，但是具体问题具体分析，需要结合实际需
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