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PHP Tutorial

PHP: printf() function

Description

The printf() function displays a formatted string from one or more arguments.

Version:

(PHP 4 and above)

Syntax:

printf(format ,arg1, arg2, arg3....)

Parameter:

Name Description Required /
Optional
Type
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 an 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 specifies 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
arg1 The argument to be added as the first %-sign in the formatted string. Required Mixed
arg2, arg3.... These arguments will be added as second %, third % etc. in the formatted string. Optional Mixed

*Mixed : Mixed indicates that a parameter may accept multiple (but not necessarily all) types.

Return value:

Returns the length of the outputted string.

Value Type: Integer.

Pictorial Presentation

php-string-printf()

Example:

<?php
$string1 = "Hello";
$var1 = 12;
printf('%s, we are learning the %uth chapter of PHP.',$string1, $var1);
?>

Output :

Hello, we are learning the 12th chapter of PHP.

View the example in the browser

See also

PHP Function Reference

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