标题：nl_langinfo
定义和用法
nl_langinfo() 函数返回指定的本地信息。
如果成功，则返回指定的本地信息。如果失败，则返回 false。
语法
nl_langinfo(element)参数描述element必需。规定要返回哪个元素。必须是说明中列出的元素之一。
说明
时间和日历：
ABDAY_(1-7) - Abbreviated name of the numbered day of the week DAY_(1-7) - Name of the numbered day of the week (DAY_1 = Sunday) ABMON_(1-12) - Abbreviated name of the numbered month of the year MON_(1-12) - Name of the numbered 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 timeT_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())货币类别：
INT_CURR_SYMBOL - Currency symbol (example: USD) CURRENCY_SYMBOL - Currency symbol (example: $) CRNCYSTR - Same as CURRENCY_SYMBOL MON_DECIMAL_POINT - Monetary decimal point character MON_THOUSANDS_SEP - Monetary thousands separator POSITIVE_SIGN - Positive value character NEGATIVE_SIGN -Negative value character MON_GROUPING - Array displaying how monetary numbers are grouped (example: 1 000 000) INT_FRAC_DIGITS - International fractional digits FRAC_DIGITS - Local fractional digits P_CS_PRECEDES - True (1) if currency symbol is placed in front of a positive value, False (0) if it is placed behind P_SEP_BY_SPACE - True (1) if there is a spaces between the currency symbol and a positive value, False (0) otherwise N_CS_PRECEDES - True (1) if currency symbol is placed in front of a negative value, False (0) if it is placed behind N_SEP_BY_SPACE - True (1) if there is a spaces between the currency symbol and a negative value, False (0) otherwise P_SIGN_POSN - Formatting setting. Possible return values:0 - Parentheses surround the quantity and currency symbol 1 - The sign string is placed in front of the quantity and currency symbol 2 - The sign string is placed after the quantity and currency symbol 3 - The sign string is placed immediately in front of the currency symbol 4 - The sign string is placed immediately after the currency symbolN_SIGN_POSN - Formatting setting. Possible return values:0 - Parentheses surround the quantity and currency symbol 1 - The sign string is placed in front of the quantity and currency symbol 2 - The sign string is placed after the quantity and currency symbol 3 - The sign string is placed immediately in front of the currency symbol 4 - The sign string is placed immediately after the currency symbol数字类别：
DECIMAL_POINT - Decimal point character RADIXCHAR - Same as DECIMAL_POINT THOUSANDS_SEP - Separator character for thousands THOUSEP - Same as THOUSANDS_SEP GROUPING - Array displaying how numbers are grouped (example: 1 000 000)通信类别：
YESEXPR - Regex string for matching 'yes' input NOEXPR - Regex string for matching 'no' input YESSTR - Output string for 'yes' NOSTR - Output string for 'no'代码集类别：
CODESET Return a string with the name of the character encoding.
提示和注释
注释：money_format() 函数无法在 windows 平台上工作。
提示：与返回所有本地格式化信息的 localeconv() 函数不同，nl_langinfo() 返回指定的信息。
PHP String 函数