NumberFormatter总是在浮点后面留下2位数

Question

我在这里结束了一点矫枉过正,但我​​似乎无法解决这个问题:

$formatter = new NumberFormatter('lv_LV', NumberFormatter::DECIMAL);

$formatter->setAttribute(NumberFormatter::FRACTION_DIGITS, 2);
$formatter->setAttribute(NumberFormatter::MIN_FRACTION_DIGITS, 2);
$formatter->setAttribute(NumberFormatter::MAX_FRACTION_DIGITS, 2);
$formatter->setAttribute(NumberFormatter::DECIMAL_ALWAYS_SHOWN, 2);

我想在这里实现的是:

+-------+--------+----------+-------+
| INPUT | ACTUAL | EXPECTED | VALID |
+-------+--------+----------+-------+
|  5,77 |   5.77 |     5.77 | YES   |
|  5,20 |    5.2 |     5.20 | NO    |
|  5,00 |      5 |     5.00 | NO    |
|     0 |      0 |     0.00 | NO    |
+-------+--------+----------+-------+

简而言之,我总是希望浮点后面有两位数.

如何使用PHP的NumberFormatter实现这一目标？

Answer 1

接受的答案是正确的,我希望澄清为什么OP没有收到预期的结果NumberFormatter.

NumberFormatter::parse将outputa float和接受string指定语言环境格式的参数.但是,Parse不会格式化输出.它相当于表演echo (float) '5.20'; //(float) 5.2

NumberFormatter::format将output使用string指定的语言环境格式并接受integer或float参数.它相当于执行echo number_format(5.20, 2); //(string) "5.20"但是number_format使用默认值作为分数和千位分隔符,它们需要根据所需的显示规则进行更改.

NumberFormatter要求您在调用parse方法之前调用该format方法,以便将特定于语言环境的字符串值转换为等效的整数或浮点值,并NumberFormatter为所需的输出分别设置.

$input = new \NumberFormatter('lv', \NumberFormatter::DECIMAL);
$input->setAttribute($input::FRACTION_DIGITS, 2); //applies rounding during format

$output = new \NumberFormatter('en', \NumberFormatter::DECIMAL);
$output->setAttribute($output::FRACTION_DIGITS, 2); //applies rounding during format

foreach (['5,77', '5,20', '5,2', '5,00', '5', '0'] as $value) {
   $parsed = $input->parse($value);
   var_dump($parsed); //convert to PHP value float
   var_dump($output->format($parsed)); //convert to locale based display
   var_dump($input->format($parsed)); //convert to locale based display
   echo "<br/>\n";
}

输入::解析

+-------+--------+----------+-------+
| Value |  Parse | EXPECTED | VALID |
+-------+--------+----------+-------+
|  5,77 |   5.77 |     5.77 | YES   |
|  5,20 |    5.2 |      5.2 | YES   |
|   5,2 |    5.2 |      5.2 | YES   |
|  5,00 |      5 |        5 | YES   |
|     5 |      5 |        5 | YES   |
|     0 |      0 |        0 | YES   |
+-------+--------+----------+-------+

输出格式

+-------+--------+----------+-------+
| Value | Format | EXPECTED | VALID |
+-------+--------+----------+-------+
|  5,77 |   5.77 |     5.77 | YES   |
|  5,20 |   5.20 |     5.20 | YES   |
|   5,2 |   5.20 |     5.20 | YES   |
|  5,00 |   5.00 |     5.00 | YES   |
|     5 |   5.00 |     5.00 | YES   |
|     0 |   0.00 |     0.00 | YES   |
+-------+--------+----------+-------+

输入::格式

+-------+--------+----------+-------+
| Value | Format | EXPECTED | VALID |
+-------+--------+----------+-------+
|  5,77 |   5,77 |     5,77 | YES   |
|  5,20 |   5,20 |     5,20 | YES   |
|   5,2 |   5,20 |     5,20 | YES   |
|  5,00 |   5,00 |     5,00 | YES   |
|     5 |   5,00 |     5,00 | YES   |
|     0 |   0,00 |     0,00 | YES   |
+-------+--------+----------+-------+