printf php

Example #1 printf(): various examples

The above example will output:

%b = '10100111101010011010101101'
%c = 'A'
%d = '43951789'
%e = '4.39518e+7'
%u = '43951789'
%u = '4251015507'
%f = '43951789.000000'
%o = '247523255'
%s = '43951789'
%x = '29ea6ad'
%X = '29EA6AD'
%+d = '+43951789'
%+d = '-43951789'

Example #2 printf(): string specifiers

The above example will output:

[monkey]
[    monkey]
[monkey    ]
[0000monkey]
[####monkey]
[####monkey]
[ many monk]
[many monk ]

Be careful:
printf ("(9.95 * 100) = %d \n", (9.95 * 100));

'994'

First %d converts a float lớn an int by truncation.

Second floats are notorious for tiny little rounding errors.

To provide a more user-friendly interface, you can use colors when printing text in the terminal.

p('Ordinary text.');
p('Warning: Check this out...', 'info');
p('Ops! Something went wrong.', 'error');
p('Yeah... done!', 'success');

function p($text, $style = '', $newLine = true) {

$styles = array(
'success' => "\033[0;32m%s\033[0m",
'error' => "\033[31;31m%s\033[0m",
'info' => "\033[33;33m%s\033[0m",

'Black' => "\033[0;30m%s\033[0m",
'Red' => "\033[0;31m%s\033[0m",
'Green' => "\033[0;32m%s\033[0m",
'Yellow' => "\033[0;33m%s\033[0m",
'Blue' => "\033[0;34m%s\033[0m",
'Purple' => "\033[0;35m%s\033[0m",
'Cyan' => "\033[0;36m%s\033[0m",
'Gray' => "\033[0;37m%s\033[0m",
'Graphite' => "\033[1;30m%s\033[0m",

'Bold Red' => "\033[1;31m%s\033[0m",
'Bold Green' => "\033[1;32m%s\033[0m",
'Bold Yellow' => "\033[1;33m%s\033[0m",
'Bold Blue' => "\033[1;34m%s\033[0m",
'Bold Purple' => "\033[1;35m%s\033[0m",
'Bold Cyan' => "\033[1;36m%s\033[0m",
'Bold White' => "\033[1;37m%s\033[0m",

'Bg Black' => "\033[40;1;37m%s\033[0m",
'Bg Red' => "\033[41;1;37m%s\033[0m",
'Bg Green' => "\033[42;1;37m%s\033[0m",
'Bg Yellow' => "\033[43;1;37m%s\033[0m",
'Bg Blue' => "\033[44;1;37m%s\033[0m",
'Bg Purple' => "\033[45;1;37m%s\033[0m",
'Bg Cyan' => "\033[46;1;37m%s\033[0m",
'Bg Gray' => "\033[47;1;37m%s\033[0m",

'Underscore' => "\033[4;37m%s\033[0m",
'Inverted' => "\033[7;37m%s\033[0m",
'Blink' => "\033[5;37m%s\033[0m",
);

$format = '%s';

if (isset($styles[$style])) {
$format = $styles[$style];
}

if ($newLine) {
$format .= PHP_EOL;
}

printf($format, $text);
}

[Editor's Note: Or just use vprintf...]

If you want lớn vì thế something lượt thích <?php printf('There is a difference between %s and %s', array('good', 'evil')); ?> (this doesn't work) instead of <?php printf('There is a difference between %s and %s', 'good', 'evil'); ?> you can use this function:

<?php
function printf_array($format, $arr)
{
return call_user_func_array('printf', array_merge((array)$format, $arr));
}
?>

Use it the following way:
<?php
$goodevil = array('good', 'evil');
printf_array('There is a difference between %s and %s', $goodevil);
?>
and it will print:
There is a difference between good and evil

You can use this function lớn format the decimal places in a number:

$num = 2.12;
printf("%.1f",$num);

prints:

2.1

see also: number_format()

instead of writing a function lớn round off a float (let's Call it 'x') accurately, it's much easier lớn add a small number lớn x and then truncate it...
For example: if you want lớn round off lớn the nearest integer, just add 0.5 lớn x and then truncate it. if x=12.6, then it would calculate 13.1, and truncate it lớn 13. If x=14.4, it would calculate 14.9 and truncate it lớn 14.

Be careful when relying on typecasting with printf(). For example,

printf("%d", "17,999")

returns "17".

Be sure that the output channel is available lớn write on before executing printf()! Some functions in classes available from various sources (in my case, DB_Sql::query() in PHPLIB) assume that printing will work, even after the mặc định output stream has been closed.

For bủ the issue was most notable in PHP4 session management when I was creating my own sess_write() handler. Since I was unable lớn find any function that checks for the output stream that printf() uses, I just had lớn drop the crazy use of the printf(). (does some function already exist lớn kiểm tra for the presence of an output stream?)

To format a dollar value as in $123.00 that may otherwise look lượt thích $123 use this

print ('$'); // the dollar sign in front of our answer
printf ('%.2f',$price);

If anyone is looking for writing a quine using printf(),
this is my example:

<?php $f='<?php $f=%c%s%c; printf($f,39,$f,39); ?>'; printf($f,39,$f,39); ?>

This also helps those who are new lớn printf() see one way of using the 'mixed args' part, rather phàn nàn just a single argument as in most examples I've seen.

If your missing features such as "-"*100 lớn print a single character multiple times you can use the slightly longer and less readable PHP equivalent printf("%'-100s",""); and sprint("%'-100s","").

be careful with integers, they cant hold large values.

printf("%d",10023123553.45634663);
will print out: 1433188961
and
printf("%.0f",10023123553.45634663);
will print out: 10023123553

copypasted from msdn

A format specification, which consists of optional and required fields, has the following form:

%[flags] [width] [.precision] [{h | l | I64 | L}]type

Each field of the format specification is a single character or a number signifying a particular format option. The simplest format specification contains only the percent sign and a type character (for example, %s). If a percent sign is followed by a character that has no meaning as a format field, the character is copied lớn stdout. For example, lớn print a percent-sign character, use %%.

The optional fields, which appear before the type character, control other aspects of the formatting, as follows:

type
Required character that determines whether the associated argument is interpreted as a character, a string, or a number (see the printf Type Field Characters table.
flags
Optional character or characters that control justification of output and printing of signs, blanks, decimal points, and octal and hexadecimal prefixes (see the Flag Characters table). More phàn nàn one flag can appear in a format specification.
width
Optional number that specifies the minimum number of characters output (see printf Width Specification).
precision
Optional number that specifies the maximum number of characters printed for all or part of the output field, or the minimum number of digits printed for integer values (see the How Precision Values Affect Type table).
h | l | I64 | L
Optional prefixes lớn type-that specify the size of argument (see the Size Prefixes for printf and wprintf Format-Type Specifiers table).

I don't know if this is useful lớn anyone, but here goes! Example for using the printf function lớn output an object.

class person
{
var $name = "";
function name($newname = NULL)
{
if(! is_null($newname))
{
$this->name=$newname;
}
return $this->name;
}
var $surname = "";
function surname($newsurname = NULL)
{
if(! is_null($newsurname))
{
$this->surname=$newsurname;
}
return $this->surname;
}
var $age = "";
function age($newage = NULL)
{
if(! is_null($newage))
{
$this->age=$newage;
}
return $this->age;
}
}

$bob = new person;
$bob->name('Bob');
$bob->surname('Builder');
$bob->age('50');

printf("Hi %s, your surname is %s and you are %s years old", $bob->name, $bob->surname, $bob->age);

Outputs:

Hi Bob, your surname is Builder and you are 50 years old

Why rounding is not same as for round()?

Try this code:

<?php
printf("%.02lf\n", 1.035);
printf("%.02lf\n", round(1.035, 2));
?>
Result:
1.03
1.04

In my opion it should be:
1.04
1.04

Why is that?

Several people have commented about problems with aligning numbers. I just wanted lớn add a bit of clarification.

According lớn the spec all True Type Fonts (especially porpotional spaced fonts) use a fixed width for numeric digits. All digits have the same width which is equal lớn the width of "0".

Where things go haywire when trying lớn align numbers is that the space character does not have the same width as a digit when using a porportional spaced fonts.

Therefore if you want lớn line up a column of numbers, you can not use leading spaces lớn position them unless you use the same quantity of space characters for each row. e.g. your numbers have leading zeros etc.

The simplest solution is lớn switch lớn a monospaced fonts. Alternativly you can use positioning tags.

Summary: Your numbers will always line up properly regardless of the fonts used, if you get the starting position lớn be consistant.

//If you want lớn make many Hidden fields you can use the function
//You can pass the values as array value,This will help you, when you are going lớn post many hiddend fields:-
function MakeHidden($ArrValues)
{
global $dearvar;
echo $dearvar;
if(is_array($ArrValues)){
foreach($ArrValues as $key=>$values)
{
echo $MakeHTML = "<input type='hidden' name='$values' value='$values'>";
}
}

else {
echo $MakeHTML = "<input type='hidden' name='$ArrValues' value='$ArrValues'>";
}
return $MakeHTML;
}

//example:-

MakeHidden(array("value1","value2","value3"));

//OutPut :-

<input type="hidden" value="value1" name="value1"/>
<input type="hidden" value="value2" name="value2"/>
<input type="hidden" value="value3" name="value3"/>

In response lớn chris dot breen at accurate dot com :

This will work, but i didn't try:
<?php
$format = 'The %2$s contains %1$d monkeys.
That is a nice %2$s full of %1$d monkeys.';
printf($format, $num, $location);
?>

Your problem came from the fact that in the string "\$s", the $ is simply escaped by the \, but but you must not vì thế that with single quoted strings. Try lớn echo your strings lớn test it, or just go lớn http://trungtamtiengnhat.edu.vn/manual/en/language.types.string.php