PHP vfprintf() Function
 Complete PHP String Reference
Definition and Usage
The vfprintf() function writes a formatted string to a
specified output stream (example: file or database).
Unlike fprintf(), the arguments in vfprintf(), are placed in an array. The
array elements will be inserted at the percent (%)
signs in the main string. This function works "step-by-step". At the first % sign,
the first array element is inserted, at the second % sign, the second array
element is inserted, etc.
The vfprintf() function returns the length of the written string.
Syntax
vfprintf(stream,format,argarray)
|
| Parameter |
Description |
| stream |
Required. Specifies where to write/output the string |
| format |
Required. Specifies the string and how to format the
variables in it. Possible format values:
- %% - Returns a percent sign
- %b - Binary number
- %c - The character according to the ASCII value
- %d - Signed decimal number
- %e - Scientific notation (e.g. 1.2e+2)
- %u - Unsigned decimal number
- %f - Floating-point number (local settings aware)
- %F - Floating-point number (not local settings
aware)
- %o - Octal number
- %s - String
- %x - Hexadecimal number (lowercase letters)
- %X - Hexadecimal number (uppercase letters)
Additional format values. These are placed between the % and the letter
(example %.2f):
- + (Forces both + and - in front of numbers. By
default, only negative numbers are marked)
- ' (Specifies what to use as padding. Default is space. Must be used
together with the width specifier.
Example: %'x20s (this uses "x" as padding)
- - (Left-justifies the variable value)
- [0-9] (Specifies the minimum width held of to the variable value)
- .[0-9] (Specifies the number of decimal digits or maximum
string length)
Note: If multiple additional format values are used, they must be in the same
order as above. |
| argarray |
Required. An array with arguments to be inserted at
the % signs in the format string |
Tips and Notes
Note: If there are more % signs than arguments, you must use placeholders. A placeholder is
inserted after the % sign,
and consists of the argument- number and "\$". See example three.
Tip: Related functions: fprintf(), printf(), sprintf(), vprintf(), and
vsprintf().
Example 1
<?php
$str = "Hello";
$number = 123;
$file = fopen("test.txt","w");
echo vfprintf($file,"%s world. Day number %u",array($str,$number));
?>
|
The output of the code above will be:
The following text will be written to the file "test.txt":
Hello world. Day number 123
|
Example 2
<?php
$num1 = 123;
$num2 = 456;
$file = fopen("test.txt","w");
vfprintf($file,"%f%f",array($num1,$num2));
?>
|
The following text will be written to the file "test.txt":
Example 3
Use of placeholders:
<?php
$number = 123;
$file = fopen("test.txt","w");
vfprintf($file,"With 2 decimals: %1\$.2f
\nWith no decimals: %1\$u",array($number));
?>
|
The following text will be written to the file "test.txt":
With 2 decimals: 123.00
With no decimals: 123
|
Complete PHP String Reference
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