PHP: printf() function
The printf() function displays a formatted string from one or more arguments.
(PHP 4 and above)
printf(format ,arg1, arg2, arg3....)
|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.
|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.
Returns the length of the outputted string.
Value Type: Integer.
<?php $string1 = "Hello"; $var1 = 12; printf('%s, we are learning the %uth chapter of PHP.',$string1, $var1); ?>
Hello, we are learning the 12th chapter of PHP.
PHP: Tips of the Day
In PHP, there are two versions of logical AND and OR operators.
|$a and $b||Both $a and $b are true|
|$a && $b||Both $a and $b are true|
|$a or $b||Either $a or $b is true|
|$a || $b||Either $a or $b is true|
Note that the && and || opererators have higher precedence than and and or. See table below:
|Evaluation||Result of $e||Evaluated as|
|$e = false || true||True||$e = (false || true)|
|$e = false or true||False||($e = false) or true|
Because of this it's safer to use && and || instead of and and or.
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