使用setlocale()不会影响PHP的数字转换 [英] Using setlocale() doesn't affect PHPs number conversions

问题描述

我有以下脚本:

<?php
 $test = "2.5";
 echo (float)$test;
 echo "\n";

 $r = setlocale(LC_ALL, "da_DK.UTF8");
 setlocale(LC_ALL, NULL);
 print_r(localeconv());
 echo "\n";
 echo (float)$test;
 echo "\n";
 echo (float)"2,5";
 echo "\n";
?>

哪个生成以下输出:

2.5
Array
(
    [decimal_point] => ,
    [thousands_sep] => .
    [int_curr_symbol] => DKK 
    [currency_symbol] => kr
    [mon_decimal_point] => ,
    [mon_thousands_sep] => .
    [positive_sign] => 
    [negative_sign] => -
    [int_frac_digits] => 2
    [frac_digits] => 2
    [p_cs_precedes] => 1
    [p_sep_by_space] => 2
    [n_cs_precedes] => 1
    [n_sep_by_space] => 2
    [p_sign_posn] => 4
    [n_sign_posn] => 4
    [grouping] => Array
        (
            [0] => 3
            [1] => 3
        )

    [mon_grouping] => Array
        (
            [0] => 3
            [1] => 3
        )

)

2,5
2

最后一行读取2-我本来希望读取2,5-并且据我在PHP文档中所看到的那样.
如果省略了对setlocale的第二次调用，则localeconv()的输出与丹麦语言环境不一致-出于我不清楚的原因.

The very last line which reads 2 - I would have expected that to read 2,5 - and as far as I can see on the PHP documentation, it should.
If the second call to setlocale is omitted then the output of localeconv() is inconsistent with the danish locale - for reasons that are unclear to me.

推荐答案

(float)"2,5"等于2(注意逗号)，而(float)"2.5"等于2.5.原因可以在手册中阅读:

(float)"2,5" equals 2 (note the comma) whereas (float)"2.5" equals 2.5. The reason can be read in the manual:

如果字符串不包含任何字符."，"e"或"E"，并且数值适合整数类型限制(由PHP_INT_MAX定义)，则字符串将被评估为整数.在所有其他情况下，它将被视为浮点数.

If the string does not contain any of the characters '.', 'e', or 'E' and the numeric value fits into integer type limits (as defined by PHP_INT_MAX), the string will be evaluated as an integer. In all other cases it will be evaluated as a float.

类型转换不受setlocale()的影响.

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