printf() function in php

PHP printf() function is used to output a formatted string. It is an inbuilt function of PHP.

Note: Also read fprint() and sprint() function for same reference.

Syntax:

1. $format represents the string and rules to format the variables inside the string. It is mandatory. It has 15 possible values.

• %%: It returns a percent sign.
• %b: It used for binary numbers.
• %c: It used to format characters according to ASCII values.
• %e: It used for the scientific notation in lowercase.
• %E: Scientific notation in uppercase.
• %u: Negative unsigned decimal numbers.
• %f: Floating point numbers ( local setting aware).
• %F: Floating point numbers (Not local setting aware).
• %g: Shorter of %e and %f.
• %G: Shorter of %E and %f.
• %o: Octal numbers.
• %s: String
• %x: Lowercased hexadecimal numbers.
• %X: Uppercased hexadecimal numbers.
• %d: Signed decimal numbers (Negative, Zero or Positive)

2. $arg1 represents an argument which inserted at the first formatted string. It is mandatory.

3. $arg2 represents an argument which inserted at the second formatted string. It is optional.

4. $arg++ is also optional and its inserted at the next formatted string.

Example 1:

<?php
$number =570350.23456;
printf("%d",$number);  // using %d to return integer from floating value
?>

Output:

Example 2:

<?php
$number =570350;
printf("%f",$number); // using %f to return floating number from integer number
?>

Output: