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PHP vfprintf() Function

PHP vfprintf() function is used to convert or transform a formatted string to any specific output stream like file or database. It get the input arguments in the form of an array. The elements of that array will be inserted along with percent (%) signs in the given input string.

Syntax:

  vfprintf($stream,$format,$array);

Parameter Values

Parameter	Description
stream	This is a required parameter. This parameter defines where to write or output the string.
format	This is a required parameter. This parameter defines the string and how to format the variables in it.
array	This is a required parameter. This parameter defines an array with arguments to be inserted at the % signs in the format string.

Here is an example of vfprintf() function in PHP:

<html>
<body>

<?php
$name = "Jerry";
$age = 21;
$file = fopen("jerry.txt","w");

echo vfprintf($file,"My name is %s and i'm %u years old.",array($name,$age));
?>
  
</body>
</html>

Output:
My name is Jerry and i'm 21 years old.

Here is an another example of different formats in vfprintf() function in PHP:

<html>
<body>

<?php
$num1 = 12345;
$num2 = -12345;


printf("%%b = %b <br>",$num1); // Binary number
printf("%%d = %d <br>",$num1); // Signed decimal number
printf("%%d = %d <br>",$num2); // Signed decimal number
printf("%%u = %u <br>",$num1); // Unsigned decimal number
printf("%%u = %u <br>",$num2); // Unsigned decimal number
printf("%%f = %f <br>",$num1); // Floating-point number
printf("%%o = %o <br>",$num1); // Octal number
printf("%%s = %s <br>",$num1); // String
printf("%%x = %x <br>",$num1); // Hexadecimal number 
?>

</body>
</html>

Output:
%b = 11000000111001
%d = 12345
%d = -12345
%u = 12345
%u = 18446744073709539271
%f = 12345.000000
%o = 30071
%s = 12345
%x = 3039

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