原创 vfprintf() 函数

vfprintf(stream,format,argarray)

Possible format values:

可能值如下：

• %% - Returns a percent sign
  
  %% -返回百分号
• %b - Binary number
  
  %b –返回二进制数
• %c - The character according to the ASCII value
  
  %c –返回与ASCII值相对应的字符
• %d - Signed decimal number
  
  %d –带有正负号的十进制数
• %e - Scientific notation (e.g. 1.2e+2)
  
  %e –科学计数符号（如：1.2e+2）
• %u - Unsigned decimal number
  
  %u –不带正负号的十进制数
• %f - Floating-point number (local settings aware)
  
  %f – 浮点数据（本地设置）
• %F - Floating-point number (not local settings aware)
  
  %F –浮点数据（非本地设置）
• %o - Octal number
  
  %o –十进制数
• %s - String
  
  %s –字符串
• %x - Hexadecimal number (lowercase letters)
  
  %x –十六进制数（小写字母）
• %X - Hexadecimal number (uppercase letters)
  
  %X –十六进制数（大写字母）

Additional format values. These are placed between the % and the letter (example %.2f):

其它格式的值。它是位于%和字母之间的（如：%.2f）

• + (Forces both + and - in front of numbers. By default, only negative numbers are marked)
  
  +（在数字前加上+和-；默认情况下，只有负数是被标记出来的）
• '
  (Specifies what to use as padding. Default is space. Must be used
  together with the width specifier. Example: %'x20s (this uses "x" as
  padding)
  
  ’（指定使用什么作为补白，默认值是空格。它必须与宽度指定器一起使用。如：%'x20s（使用“x”作为padding））
• - (Left-justifies the variable value)
  
  - （左调整变量值）
• [0-9] (Specifies the minimum width held of to the variable value)
  
  [0-9]（指定变量值的最小宽度）
• .[0-9] (Specifies the number of decimal digits or maximum string length)
  
  .[0-9]（指定十进制数值或最大字符串长度）

Note: If multiple additional format values are used, they must be in the same order as above.

注意：如果使用附加格式值，那么它必须与上述顺序相同

<?php
$str = "Hello";
$number = 123;
$file = fopen("test.txt","w");
echo vfprintf($file,"%s world. Day number %u",array($str,$number));
?> 

27

Hello world. Day number 123

<?php
$num1 = 123;
$num2 = 456;
$file = fopen("test.txt","w");
vfprintf($file,"%f%f",array($num1,$num2));
?>

123.000000456.000000

<?php
$number = 123;
$file = fopen("test.txt","w");
vfprintf($file,"With 2 decimals: %1$.2f
nWith no decimals: %1$u",array($number));
?>

With 2 decimals: 123.00 
With no decimals: 123