PHP fscanf() Function

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Definition and Usage

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



Parameter Description
file Required. Specifies the file to check
format Required. Specifies the format.

Possible format values:

  • %% - Returns a percent sign
  • %b - Binary number
  • %c - The character according to the ASCII value
  • %d - Signed decimal number
  • %e - Scientific notation (e.g. 1.2e+2)
  • %u - Unsigned decimal number
  • %f - Floating-point number (local settings aware)
  • %F - Floating-point number (not local settings aware)
  • %o - Octal number
  • %s - String
  • %x - Hexadecimal number (lowercase letters)
  • %X - Hexadecimal number (uppercase letters)

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

  • + (Forces both + and - in front of numbers. By default, only negative numbers are marked)
  • ' (Specifies what to use as padding. Default is space. Must be used together with the width specifier. Example: %'x20s (this uses "x" as padding)
  • - (Left-justifies the variable value)
  • [0-9] (Specifies the minimum width held of to the variable value)
  • .[0-9] (Specifies the number of decimal digits or maximum string length)

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

mixed Optional.

Tips and Notes

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.

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