Output a formatted string
vprintf ( string $format , array $args ) : int
The format string is composed of zero or more directives: ordinary characters (excluding %) that are copied directly to the result and conversion specifications, each of which results in fetching its own parameter.
A conversion specification follows this prototype: %[argnum$][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:
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.
|%||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:
|integer||d, u, c, o, x, X, b|
|double||g, G, e, E, f, F|
Returns the length of the outputted string.
<? $year = date("Y"); $month = date("m"); $day = date("d"); $format = "%04d-%02d-%02d"; $args = array($year, $month, $day); vprintf($format, $args); ?>
<? $year = date("Y"); $month = date("m"); $day = date("d"); $format = "%04d-%02d-%02d"; $args = array($year, $month, $day); $return = vprintf($format, $args); echo PHP_EOL . $return; ?>