vfprintf
Description
Syntax
vfprintf ( resource $handle , string $format , array $args ) : int
Parameters
handle
format
The format string is composed of zero or more directives: ordinary characters (excluding %) that are copied directly to the result and conversion specifications, each of which results in fetching its own parameter.
A conversion specification follows this prototype: %[argnum$][flags][width][.precision]specifier.
Argnum
An integer followed by a dollar sign $, to specify which number argument to treat in the conversion.
Flags
Flag | Description |
---|---|
- | Left-justify within the given field width; Right justification is the default |
+ | Prefix positive numbers with a plus sign +; Default only negative are prefixed with a negative sign. |
(space) | Pads the result with spaces. This is the default. |
0 | Only left-pads numbers with zeros. With s specifiers this can also right-pad with zeros. |
'(char) | Pads the result with the character (char). |
Width
An integer that says how many characters (minimum) this conversion should result in.
Precision
A period . followed by an integer who's meaning depends on the specifier:
For e, E, f and F specifiers: this is the number of digits to be printed after the decimal point (by default, this is 6).
For g and G specifiers: this is the maximum number of significant digits to be printed.
For s specifier: it acts as a cutoff point, setting a maximum character limit to the string.
Note: If the period is specified without an explicit value for precision, 0 is assumed.
Note: Attempting to use a position specifier greater than PHP_INT_MAX will generate warnings.
Specifier
Specifier | Description |
---|---|
% | A literal percent character. No argument is required. |
b | The argument is treated as an integer and presented as a binary number. |
c | The argument is treated as an integer and presented as the character with that ASCII. |
d | The argument is treated as an integer and presented as a (signed) decimal number. |
e | The argument is treated as scientific notation (e.g. 1.2e+2). The precision specifier stands for the number of digits after the decimal point since PHP 5.2.1. In earlier versions, it was taken as number of significant digits (one less). |
E | Like the e specifier but uses uppercase letter (e.g. 1.2E+2). |
f | The argument is treated as a float and presented as a floating-point number (locale aware). |
F | The argument is treated as a float and presented as a floating-point number (non-locale aware). |
g | General format. Let P equal the precision if nonzero, 6 if the precision is omitted, or 1 if the precision is zero. Then, if a conversion with style E would have an exponent of X: If P > X ≥ −4, the conversion is with style f and precision P − (X + 1). Otherwise, the conversion is with style e and precision P − 1. |
G | Like the g specifier but uses E and f. |
o | The argument is treated as an integer and presented as an octal number. |
s | The argument is treated and presented as a string. |
u | The argument is treated as an integer and presented as an unsigned decimal number. |
x | The argument is treated as an integer and presented as a hexadecimal number (with lowercase letters). |
X | The argument is treated as an integer and presented as a hexadecimal number (with uppercase letters). |
Warning: The c type specifier ignores padding and width
Warning: Attempting to use a combination of the string and width specifiers with character sets that require more than one byte per character may result in unexpected results
Variables will be co-erced to a suitable type for the specifier:
Type | Specifiers |
---|---|
string | s |
integer | d, u, c, o, x, X, b |
double | g, G, e, E, f, F |
args
Return
Returns the length of the outputted string.
Examples
1 · handle format args
<? $filename = 'vfprintf.txt'; $mode = 'w+'; $handle = fopen($filename, $mode); $year = date("Y"); $month = date("m"); $day = date("d"); $format = "%04d-%02d-%02d"; $args = array($year, $month, $day); vfprintf($handle, $format, $args); rewind($handle); fpassthru($handle); fclose($handle);
2024-12-07
2 · Return
<? $filename = 'vfprintf.txt'; $mode = 'w'; $handle = fopen($filename, $mode); $year = date("Y"); $month = date("m"); $day = date("d"); $format = "%04d-%02d-%02d"; $args = array($year, $month, $day); $return = vfprintf($handle, $format, $args); fclose($handle); echo $return;
10
Links
String
- addcslashes
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