(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
vsprintf — 返回格式化字符串
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
.
An integer followed by a dollar sign $
,
to specify which number argument to treat in the conversion.
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). |
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:
e
, E
,
f
and F
specifiers: this is the number of digits to be printed
after the decimal point (by default, this is 6).
g
, G
,
h
and H
specifiers: this is the maximum number of significant
digits to be printed.
s
specifier: it acts as a cutoff point,
setting a maximum character limit to the string.
注意: If the period is specified without an explicit value for precision, 0 is assumed.
注意: Attempting to use a position specifier greater than
PHP_INT_MAX
will generate warnings.
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). |
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 .
|
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
|
args
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
。
示例 #1 vsprintf(): 前导 0 的整数
<?php
print vsprintf("%04d-%02d-%02d", explode('-', '1988-8-1'));
?>
以上例程会输出:
1988-08-01