php fscanf()函数使用方法详解

网络整理 - 08-26

  Definition and Usage

  定义和用法

  The fscanf() function parses the input from an open file according to the specified format.

  fscanf()函数的作用是:从文件中按照指定的格式输入。

  Syntax

  语法

  fscanf(file,format,mixed)

  Parameter参数Description描述

  fileRequired. Specifies the file to check

  必要参数。指定文件对象

  formatRequired. Specifies the format.

  必要参数。指定格式

  Possible format values:

  可用的格式值:

  %% - Returns a percent sign

  %% - 返回一个“%”

  %b - Binary number

  %b – 二进制数

  %c - The character according to the ASCII value

  %c – 某字符所对应的ASCII值

  %d - Signed decimal number

  %d – 包含正负号的十进制数(可包含正负数)

  %e - Scientific notation (e.g. 1.2e+2)

  %e – 科学技术符号(例如:1.2e+2)

  %u - Unsigned decimal number

  %u – 不包含正负号的十进制数

  %f - Floating-point number (local settings aware)

  %f – 浮点数字(本地属性)

  %F - Floating-point number (not local settings aware)

  %F – 浮点数字(非本地属性)

  %o - Octal number

  %o – 十进制数字

  %s - String

  %s – 字符串

  %x - Hexadecimal number (lowercase letters)

  %x – 十六进制数(小写字母)

  %X - Hexadecimal number (uppercase letters)

  %X – 十六进制数(大写字母)

  Additional format values. These are placed between the % and the letter (example %.2f):

  其它的文本格式值。它是位于%和字母之间的(如:%.2f):

  + (Forces both + and - in front of numbers. By default, only negative numbers are marked)

  +(在数字前面加上‘+’或‘-’来定义数字的正负性;默认情况下,正数不做标记)

  ' (Specifies what to use as padding. Default is space. Must be used together with the width specifier. Example: %'x20s (this uses "x" as padding)

  ’(指定使用旁白[padding]的类型。默认是空格space,它必须同时指定宽度,例如:%'x20s (这里使用 "x" 作为旁白[padding]) )

  - (Left-justifies the variable value)

  -(向左调整变量值)

  [0-9] (Specifies the minimum width held of to the variable value)

  [0-9](指定了变量值的最小宽度)

  .[0-9] (Specifies the number of decimal digits or maximum string length)

  .[0-9](指定了十位数字或最大字符串长度)

  Note: If multiple additional format values are used, they must be in the same order as above.

  注意:如果要使用多个上述的值,顺序必须按照上面的顺序,不能打乱。

  mixedOptional.

  可选参数

  Tips and Notes

  注意点

  Note: Any whitespace in the format string matches any whitespace in the input stream. This means that a tab (/t) in the format string can match a single space character in the input stream.

  注意:任何format的值中的空白部分[whitespace]与input内容相似;这意味着tab键(/t)[制表符]和input内容的一个单一的空格[space]相似。