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
$float = 0.123;
For historical reasons "double" is returned by gettype() in case of a float, and not simply "float"
Floats are floating point numbers, which allow more output precision than plain integers.
Floats and integers can be used together due to PHP's loose casting of variable types:
$sum = 3 + 0.14; echo $sum;
php does not show float as float number like other languages, for example:
$var = 1; echo ((float) $var);
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