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Hàm nl-langinfo() trong PHP

Hướng dẫn cách sử dụng hàm nl-langinfo() trong lập trình PHP

Tác dụng của hàm nl-langinfo()

The nl_langinfo() function is used to access specific local information.

Note: This function is not implemented on Windows platforms and hence won't work.

The following table summarizes the technical details of this function.

Return Value: Returns the specific information on success, or FALSE on failure.
Version: PHP 4.1.0+

Syntax

The basic syntax of the nl_langinfo() function is given with:

nl_langinfo(item);

The following example shows the nl_langinfo() function in action.

<?php
// Returns the name of the character encoding
echo nl_langinfo(CODESET);
?>

Tip: Unlike localeconv() function, which returns all of the elements of locale formatting information, nl_langinfo() allows you to access any specific element.


Parameters

The nl_langinfo() function accepts the following parameters.

Parameter Description
item Required. Specifies which item's information to return.

An 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.

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.

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