Funzione PHP fscanf()

Definizione e utilizzo

La funzione fscanf() analizza l'input da un file aperto in base al formato specificato.

Nota: qualsiasi spazio bianco nella stringa di formato corrisponde a qualsiasi spazio bianco nel flusso di input. Ciò significa che una scheda (\t) nella stringa di formato può corrispondere a un singolo carattere spazio nel flusso di input.

Sintassi

fscanf(file, format, mixed)

Valori dei parametri

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.

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.

Dettagli tecnici

Valore di ritorno:	La stringa letta, FALSE in caso di errore
Versione PHP:	4.0.1+

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Funzione PHP fscanf()

Definizione e utilizzo

Sintassi

Valori dei parametri

Dettagli tecnici