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HomeBackend DevelopmentPHP Tutorialphp中sprintf与printf函数用法区别解析_php技巧

下面是一个示例:四舍五入保留小数点后两位

复制代码 代码如下:

$num1 = 21;
echo sprintf("%0.2f",$num1)."
"; //输出 21.00
$num2 = 16.3287;
echo sprintf("%0.2f",$num2)."
"; //输出 16.33
$num3 = 32.12329;
echo sprintf("%0.2f",$num3)."
"; //输出 32.12
?>

解释下 %0.2f 的含义:

% 表示起始字符
0 表示空位用0填满
2 表示小数点后必须占两位
f 表示转换成浮点数


转换字符
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
% 印出百分比符号,不转换。
b 整数转成二进位。
c 整数转成对应的 ASCII 字元。
d 整数转成十进位。
f 倍精确度数字转成浮点数。
o 整数转成八进位。
s 整数转成字串。
x 整数转成小写十六进位。
X 整数转成大写十六进位。

printf与sprintf的区别

1. printf函数:

int printf ( string format [, mixed args [, mixed ...]] )

Produces output according to format , which is described in the documentation for sprintf() .

Returns the length of the outputted string.

把文字格式化以后输出,如:

复制代码 代码如下:

$name="hunte";
$age=25;
printf("my name is %s, age %d", $name, $age);

2. sprintf函数:
string sprintf ( string format [, mixed args [, mixed ...]] )

Returns a string produced according to the formatting string format .

跟printf相似,但不打印,而是返回格式化后的文字,其他的与printf一样。

3. print函数:

是函数,可以返回一个值,只能有一个参数。

int print ( string arg )

Outputs arg . Returns 1 , always.

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