Write a string produced according to format to the stream resource specified by handle. Operates as fprintf() but accepts an array of arguments, rather than a variable number of arguments. Test vfprintf online.
int vfprintf ( resource $handle , string $format , array $args )
PHP Documentation by the PHP Documentation Group
(PHP 5, PHP 7)
vfprintf — Write a formatted string to a stream
$args) : int
Write a string produced according to
format to the
stream resource specified by
Operates as fprintf() but accepts an array of arguments, rather than a variable number of arguments.
The format string is composed of zero or more directives: ordinary characters (excluding %) that are copied directly to the result and conversion specifications, each of which results in fetching its own parameter.
A conversion specification follows this prototype: %[argnum$][flags][width][.precision]specifier.
An integer followed by a dollar sign $, to specify which number argument to treat in the conversion.
|-||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).|
An integer that says how many characters (minimum) this conversion should result in.
A period . followed by an integer who's meaning depends on the specifier:
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_MAXwill generate warnings.
|%||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). Available as of PHP 5.0.3.|
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).|
The c type specifier ignores padding and width
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:
|integer||d, u, c, o, x, X, b|
|double||g, G, e, E, f, F|
Returns the length of the outputted string.
Example #1 vfprintf(): zero-padded integers
if (!($fp = fopen('date.txt', 'w')))
vfprintf($fp, "%04d-%02d-%02d", array($year, $month, $day));
// will write the formatted ISO date to date.txt
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