PHP string printf() Function

PHP string printf() function predefined functions. It is used to output a formatted string. We can pass the arg1, arg2, arg++ parameters at percent (%) signs in the main string.

Syntax:

Parameter	Description	Required/Optional
format	Specify the string. Following are the possible format values: %% - Returns a percent sign %b : Binary number %c : The character according to the ASCII value %d : Signed decimal number (negative, zero or positive) %e : Scientific notation using a lowercase (e.g. 1.2e+2) %E : Scientific notation using a uppercase (e.g. 1.2E+2) %u : Unsigned decimal number (equal to or greather than zero) %f : Floating-point number (local settings aware) %F : Floating-point number (not local settings aware) %g : shorter of %e and %f %G : shorter of %E and %f %o : Octal number %s : String %x : Hexadecimal number (lowercase letters) %X : Hexadecimal number (uppercase letters)	Required
arg1	The argument to be inserted at the first %-sign.	Required
arg2	The argument to be inserted at the second %-sign.	Optional
arg++	The argument to be inserted at the third,fourth, etc. %s sign	optional

Example 1

<?php
$version = 7;
$str = "JAVATPOINT";
printf("We are Learning PHP %u form  %s.",$version,$str);
?>

Output:

We are Learning PHP 7 form JAVATPOINT.

Example 2

<?php
$number = 12345;
printf("%f",$number);
?>

Output:

12345.000000

Example 3

<?php
$number = 23456;
printf("With 2 decimals: %1$.2f
<br>With no decimals: %1$u",$number);
?>

Output:

With 2 decimals: 23456.00 
With no decimals: 23456

Example 4

<?php
$str1 = "Hello";
$str2 = "Hello PHP!";
printf("[%s]<br>",$str1); // String
printf("[%8s]<br>",$str1); // Right-justifies the string with spaces
printf("[%-8s]<br>",$str1); // Left-justifies the string value with spaces
printf("[%08s]<br>",$str1); // Zero-padding
printf("[%'*8s]<br>",$str1); // Adds "*"
printf("[%8.8s]<br>",$str2); // Left-justifies the string with spaces (cuts off characters after the specified value)
?>

Output:

[Hello]
[ Hello]
[Hello ]
[000Hello]
[***Hello]
[Hello PH]

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