PHP vfprintf() Function
The PHP vfprintf() function is used to write a formatted string to a specified output stream like a file.
It has the following syntax
int vfprintf ( resource $handle , string $format , array $args)
Here is an example of using vfprintf():
$number = 9;
$fruit = "Apples";
$file = fopen("food.txt","w");
echo vfprintf($file,"The group ate %u %s today.",array($number,$fruit));
// Outputs: 29 and writes "The group ate 9 Apples today." to the file.