PHP vfprintf

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PHP : vfprintf() function

Description

The vfprintf() function writes a formatted string to a stream.

Version

(PHP 5)

Syntax

vfprintf (file_handle, format, array_args) 

Parameters

Name

Description

Required /
Optional

Type

file_handle

When a file is successfully opened by fopen() or fsockopen() it returns a resource ID, which is referred as file handler or file pointer.

Required

Resource

format

Each conversion specification starts with a single percent sign (%) and ends with the following conversion characters. 
% - returns a percent sign.
b - the argument is treated as an integer and display it as a binary number. 
c - the argument is treated as an integer and display it as a ASCII value. 
d - the argument is treated as an integer and display as a signed decimal number. 
e - the argument is treated as scientific notation (e.g. 1.2e+2).
E - the argument treated as scientific notation (e.g.1.2E+2).
u - the argument is treated as an integer, and display as an unsigned decimal number. 
f- the argument is treated as a float, and display as a floating-point number. (local aware)
F - the argument is treated as a float, and display as a floating-point number (non-locale aware).
g - shorter of %e and %f. 
G - shorter of %E and %f. 
o- the argument is treated as an integer, and display as an octal number.
s - the argument is treated as string and display as a string.
x - the argument is treated as an integer and display as a hexadecimal number (with lowercase letters). 
X - the argument is treated as an integer and display as a hexadecimal number (with uppercase letters). 

Optional specification : 
Sign specifier : display a sign (+ or -) in front a number. By default a - sign is used in front of a number if it is negative. 

Padding character : 
Default character is space. An alternate padding character can be specified by prefixing it with a single quote.
Alignment specifier. : - character makes the alignment left-justified. The default is right justified. 
Width specifier : An integer number specifies the width of the field. 
Precision specifier : The argument specify how many decimal number should be displayed for floating numbers. When using this specifier on a string, it acts as a cutoff point, setting a maximum character limit to the string.

Required

String

array_args

Display array values as a formatted string according to the specified format.

Required

Array

 

Return value

The length of the outputted string.

Value Type : Integer

Example of php vfprintf() function

  1. $string1 = 'My Roll No. is :';  

  2. $roll_no = 22;  

  3. $file_handler = fopen('testvf.txt','w');  

  4. vfprintf($file_handler, '%s   %u', array($string1, $roll_no));  

  5. fclose($file_handler);  

  6. // Let open the file file once again and read the content.  

  7. $file_name = 'testvf.txt';  

  8. $file_handler = fopen($file_name, 'r');  

  9. $file_data = fread($file_handler, 1024);  

  10. fclose($file_handler);  

  11. echo ($file_data);  

  12. ?>  

Output :

My Roll No. is : 22