Write a string produced according to format to the stream resource specified by stream.
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.Argnum
An integer followed by a dollar sign $, to specify which number argument to treat in the conversion.
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).
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, G, h and H 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.
If the period is specified without an explicit value for precision, 0 is assumed.
Attempting to use a position specifier greater than PHP_INT_MAX will generate warnings.
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). 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
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. h Like the g specifier but uses F. Available as of PHP 8.0.0. H Like the g specifier but uses E and F. Available as of PHP 8.0.0. 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:
Type Specifiers string s int d, u, c, o, x, X, b float e, E, f, F, g, G, h, H
Returns the length of the outputted string.