Php/docs/function.vsprintf

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vsprintf

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

vsprintf返回格式化字符串


说明

vsprintf ( string $format , array $args ) : string

作用与 sprintf() 函数类似,但是接收一个数组参数,而不是一系列可变数量的参数。


参数

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 说明
- 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.

Specifiers
Specifier 说明
% 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.

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 Handling
Type Specifiers
string s
integer d,

u, c, o, x, X, b

double g,

G, e, E, f, F

args


返回值

根据 format 参数指定的格式,在一个字符串中返回一系列值, 或者在失败时返回 false


范例

Example #1 vsprintf(): 前导 0 的整数

<?phpprint vsprintf("%04d-%02d-%02d", explode('-', '1988-8-1'));?>

以上例程会输出:


1988-08-01

参见