PHP: vfprintf() function
The vfprintf() function writes a formatted string to a stream.
vfprintf (file_handle, format, array_args)
|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.
|array_args||Display array values as a formatted string according to the specified format.||Required||Array|
The length of the outputted string.
Value Type : Integer
Example of php vfprintf() function
<?php $string1 = 'My Roll No. is :'; $roll_no = 22; $file_handler = fopen('testvf.txt','w'); vfprintf($file_handler, '%s %u', array($string1, $roll_no)); fclose($file_handler); // Let open the file file once again and read the content. $file_name = 'testvf.txt'; $file_handler = fopen($file_name, 'r'); $file_data = fread($file_handler, 1024); fclose($file_handler); echo ($file_data); ?>
My Roll No. is : 22
PHP: Tips of the Day
A resource is a special type of variable that references an external resource, such as a file, socket, stream, document, or connection
$file = fopen('/etc/passwd', 'r'); echo gettype($file); # Out: resource echo $file; # Out: Resource id #2
There are different (sub-)types of resource. You can check the resource type using get_resource_type():
$file = fopen('/etc/passwd', 'r'); echo get_resource_type($file); #Out: stream $sock = fsockopen('www.google.com', 80); echo get_resource_type($sock); #Out: stream
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