# nl_langinfo

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

nl_langinfo — Query language and locale information

### 说明

nl_langinfo(int `$item`): string|false

nl_langinfo() is used to access individual elements of the locale categories. Unlike localeconv(), which returns all of the elements, nl_langinfo() allows you to select any specific element.

### 参数

`item`

  `item` may be an integer value of the element or the constant name of the element. The following is a list of constant names for `item` that may be used and their description. Some of these constants may not be defined or hold no value for certain locales.

  nl_langinfo Constants
  Constant | Description
  --- | ---
  `LC_TIME` Category Constants
  `ABDAY_(1-7)` | Abbreviated name of n-th day of the week.
  `DAY_(1-7)` | Name of the n-th day of the week (DAY_1 = Sunday).
  `ABMON_(1-12)` | Abbreviated name of the n-th month of the year.
  `MON_(1-12)` | Name of the n-th month of the year.
  `AM_STR` | String for Ante meridian.
  `PM_STR` | String for Post meridian.
  `D_T_FMT` | String that can be used as the format string for strftime() to represent time and date.
  `D_FMT` | String that can be used as the format string for strftime() to represent date.
  `T_FMT` | String that can be used as the format string for strftime() to represent time.
  `T_FMT_AMPM` | String that can be used as the format string for strftime() to represent time in 12-hour format with ante/post meridian.
  `ERA` | Alternate era.
  `ERA_YEAR` | Year in alternate era format.
  `ERA_D_T_FMT` | Date and time in alternate era format (string can be used in strftime()).
  `ERA_D_FMT` | Date in alternate era format (string can be used in strftime()).
  `ERA_T_FMT` | Time in alternate era format (string can be used in strftime()).
  `LC_MONETARY` Category Constants
  `INT_CURR_SYMBOL` | International currency symbol.
  `CURRENCY_SYMBOL` | Local currency symbol.
  `CRNCYSTR` | Same value as `CURRENCY_SYMBOL`.
  `MON_DECIMAL_POINT` | Decimal point character.
  `MON_THOUSANDS_SEP` | Thousands separator (groups of three digits).
  `MON_GROUPING` | Like `"grouping"` element.
  `POSITIVE_SIGN` | Sign for positive values.
  `NEGATIVE_SIGN` | Sign for negative values.
  `INT_FRAC_DIGITS` | International fractional digits.
  `FRAC_DIGITS` | Local fractional digits.
  `P_CS_PRECEDES` | Returns 1 if `CURRENCY_SYMBOL` precedes a positive value.
  `P_SEP_BY_SPACE` | Returns 1 if a space separates `CURRENCY_SYMBOL` from a positive value.
  `N_CS_PRECEDES` | Returns 1 if `CURRENCY_SYMBOL` precedes a negative value.
  `N_SEP_BY_SPACE` | Returns 1 if a space separates `CURRENCY_SYMBOL` from a negative value.
  `P_SIGN_POSN` | Returns 0 if parentheses surround the quantity and `CURRENCY_SYMBOL`. Returns 1 if the sign string precedes the quantity and `CURRENCY_SYMBOL`. Returns 2 if the sign string follows the quantity and `CURRENCY_SYMBOL`. Returns 3 if the sign string immediately precedes the `CURRENCY_SYMBOL`. Returns 4 if the sign string immediately follows the `CURRENCY_SYMBOL`.
  `N_SIGN_POSN`
  `LC_NUMERIC` Category Constants
  `DECIMAL_POINT` | Decimal point character.
  `RADIXCHAR` | Same value as `DECIMAL_POINT`.
  `THOUSANDS_SEP` | Separator character for thousands (groups of three digits).
  `THOUSEP` | Same value as `THOUSANDS_SEP`.
  `GROUPING` |
  `LC_MESSAGES` Category Constants
  `YESEXPR` | Regex string for matching `"yes"` input.
  `NOEXPR` | Regex string for matching `"no"` input.
  `YESSTR` | Output string for `"yes"`.
  `NOSTR` | Output string for `"no"`.
  `LC_CTYPE` Category Constants
  `CODESET` | Return a string with the name of the character encoding.

### 返回值

Returns the element as a string, or `false` if `item` is not valid.

### 示例

示例 #1 nl_langinfo() example

`<?php
var_dump(nl_langinfo(CODESET));
var_dump(nl_langinfo(YESEXPR));
?>`

以上示例的输出类似于：

    string(14) "ANSI_X3.4-1968"
    string(5) "^[yY]"

### 注释

> 注意: 此函数未在 Windows 平台下实现。

### 参见

- setlocale() - 设置区域信息
- localeconv() - Get numeric formatting information

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