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==Adding the <pre> and </pre> tags so the spaces display==



<source lang="html4strict">

<?php
printf("<pre>Space padding can be tricky in HTML % 5d.</pre
>", 42);
?>

</source>

==Demonstrating Some Type Specifiers==



<source lang="html4strict">

<html>
<head>
<title>Demonstrating Some Type Specifiers</title>
</head>
<body>
<div>
<?php
$number = 543;
printf("Decimal: %d ", $number );
printf("Binary: %b ", $number );
printf("Double: %f ", $number );
printf("Octal: %o ", $number );
printf("String: %s ", $number);
printf("Hex (lower): %x ", $number );
printf("Hex (upper): %X ", $number );
?>
</div>
</body>
</html>

</source>

==Displaying a real number in money format==



<source lang="html4strict">

<?php
printf("Please pay $%.2f. ", 42.4242);
?>

</source>

==Displaying long text with an ellipsis==



<source lang="html4strict">

<?
printf(substr_replace("this is a test"," ...",5));
?>

</source>

==Displaying signs with printf()==



<source lang="html4strict">

<?
$min = -40;
$max = 40;
printf("The computer can operate between %+d and %+d degrees Celsius.", $min, $max);
?>

</source>

==Displaying the same number in different formats==



<source lang="html4strict">

<?php
$value=42;
printf("%d ",$value);
printf("%b ",$value);
printf("%c ",$value);
printf("%f ",$value);
printf("%o ",$value);
printf("%s ",$value);
printf("%x ",$value);
printf("%X ",$value);
?>

</source>

==Example: Displaying a number in binary format==



<source lang="html4strict">

<?php
printf("The computer stores the number 42 internally as %b.",42);
?>

</source>

==Format an integer and a floating-point value with the printf() function.==



<source lang="html4strict">

<?php
$i = 123456;
$f = 98765.567;
printf("\$i = %x and \$i = %b\n", $i, $i);
printf("\$i = %d and \$f = %f\n", $i, $f);
printf("\$i = %09d and \$f = %0.2f\n", $i, $f);
?>

</source>

==Format strings for use in printf( )==



<source lang="html4strict">

Format Meaning

%% A literal percent character; no matching parameter is required

%b Parameter is an integer; express it as binary

%c Parameter is an integer; express it as a character with that ASCII value

%d Parameter is a positive integer; express it as decimal

%f Parameter is a float; express it as a float

%o Parameter is an integer; express it as octal

%s Parameter is a string; express it as a string

%x Parameter is an integer; express it as hexadecimal with lowercase letters

%X Parameter is an integer; express it as hexadecimal with uppercase letters
<?
$number = 123;
printf("123 in binary is: %b", $number);
printf("123 in hex is: %h", $number);
printf("123 as a string is: %s", $number);
printf("%% allows you to print percent characters");

$number = 123.456;
$formatted = number_format($number, 2) . "\n";
print "Formatted number is $formatted\n";
printf("Formatted number is %.2f\n", $number);
?>

</source>

==Formatting a price with printf()==



<source lang="html4strict">

<?
$price = 5; $tax = 0.075;
printf("The dish costs $%.2f", $price * (1 + $tax));
?>

</source>

==int printf ( string format [, mixed argument [, mixed ...]] ) is the standard C way to format text==



<source lang="html4strict">

<?
$animals = "lions, tigers, and bears";
printf("There were %s - oh my!", $animals);
?>

</source>

==Left-aligned by prepending a minus symbol (-) to the field width specifier==



<source lang="html4strict">

<?
printf ("%-20s\n", "Left aligned");
?>

</source>

==Padding Output with the Padding Specifier==



<source lang="html4strict">

<?
printf("%04d", 36);
?>

</source>

==Pad with leading zeroes:==



<source lang="html4strict">

<?
$red = 1;
$green = 1;
$blue = 1;
printf( "#%02x%02x%02x", $red, $green, $blue);
?>

</source>

==printf and format==



<source lang="html4strict">

<?php
printf("$%01.2f", 43.2);
printf("%d beer %s", 100, "bottles");
printf("%15s", "Some text");
?>

</source>

==printf() and sprintf() Formatting Types==



<source lang="html4strict">

Type Description
% A literal percent character. No argument is required.
b The argument is treated as an integer and presented as a binary number.
c The argument is treated as an integer and presented as the character with that American Standard Code for Information Interchange (ASCII) value.
d The argument is treated as an integer and presented as a (signed) decimal number.
e The argument is treated as scientific notation (for example, 1.2e+2).
u The argument is treated as an integer and presented as an unsigned decimal number.
f The argument is treated as a float and presented as a floating-point number (locale aware).
F The argument is treated as a float and presented as a floating-point number (nonlocale aware). Available since PHP 4.3.10 and PHP 5.0.3.
o The argument is treated as an integer and presented as an octal number.
s The argument is treated and presented as a string.
x The argument is treated as an integer and presented as a hexadecimal number (with lowercase letters).
X The argument is treated as an integer and presented as a hexadecimal number (with upper-case letters).

</source>

==printf and string format==



<source lang="html4strict">

<?php
printf("The %2\$s likes to %1\$s", "bark", "dog"); // The dog likes to bark
printf("The %1\$s says: %2\$s, %2\$s.", "dog", "bark"); // The dog says: bark, bar.
?>

</source>

==printf() and Type Specifiers==



<source lang="html4strict">

Specifier Description

d Displays an argument as a decimal number

b Displays an integer as a binary number

c Displays an integer as its ASCII equivalent

f Displays an integer as a floating-point number (double)

o Displays an integer as an octal number (base 8)

s Displays an argument as a string

x Display an integer as a lowercase hexadecimal number (base 16)

X Displays an integer as an uppercase hexadecimal number (base 16)

</source>

==@printf("Maths: %d; English: %d; History: %d; Biology: %d.\n"==



<source lang="html4strict">

<?php

$scores = array(88, 75);
@list($maths, $english, $history) = $scores;
@printf("Maths: %d; English: %d; History: %d; Biology: %d.\n",$maths, $english, $history, $biology);
?>

</source>

==printf puts the numbers into the string==



<source lang="html4strict">

<?php
printf("The computer stores the numbers 42, and 256 internally as %b and %b.",42,256);
?>

</source>

==printf() Type Specifiers==



<source lang="html4strict">

Option Value

% A literal percent characters (takes no parameters)

b Integer represented as a binary number (for example: 101110111)

c Integer represented as the character corresponding to its ASCII value

d Integer represented as a signed integer number

u Integer represented as an unsigned number

f Floating-point value

o Integer represented as an octal value

s String value

x Integer value represented in hexadecimal notation (with lowercase characters)

X Integer value represented in hexadecimal notation (with uppercase characters)

</source>

==The printf function formats complex strings using a single expression.==



<source lang="html4strict">

<?php
$n = 15.32;
$log = log ($n);
printf ("log (%0.2f) = %.5f\n", $n, $log);
?>

</source>

==Use printf to output float numbers==



<source lang="html4strict">

$hamburger = 4.91235;
$milkshake = 1.12395;
$cola = .85;
$food = 123.123;
$tax = 1.075;
$tip = 1.16;
printf("%1d %9s at \$%.2f each: \$%.2f\n", 2, "Hamburger", $hamburger, 2 * $hamburger);
printf("%1d %9s at \$%.2f each: \$%.2f\n", 1, "Milkshake", $milkshake, $milkshake);
printf("%1d %9s at \$%.2f each: \$%.2f\n", 1, "Cola", $cola, $cola);
printf("%25s: \$%.2f\n", "Food and Drink Total", $food);
printf("%25s: \$%.2f\n", "Total with Tax", $food + $tax);
printf("%25s: \$%.2f\n", "Total with Tax and Tip", $food + $tax + $tip);

</source>

==Using printf() to Format a List of Product Prices==



<source lang="html4strict">

<html>
<head>
<title>Using printf() to Format a List of Product Prices</title>
</head>
<body>
<?php
$products = array (
"A"=>2.4,
"B"=>4,
"C"=>80.6
);
print "<pre>";
printf ("%-20s%23s\n", "Name", "Price");
printf ("%"-43s\n", "");
foreach ( $products as $Key=>$val ) {
printf ("%-20s%20.2f\n", $Key, $val);
}
print "</pre>";
?>
</body>
</html>

</source>

==When you specify a color in HTML, you combine three hexadecimal numbers between 00 and FF.==



<source lang="html4strict">

<?
$red = 204;
$green = 204;
$blue = 204;
printf( "#%x%x%x", $red, $green, $blue);
?>

</source>

==Working with printf()==



<source lang="html4strict">

<?
printf ("This is my number: %d", 55);
?>

</source>

==Zero-padding with printf()==



<source lang="html4strict">

<?
$zip = "6520";
$month = 2;
$day = 6;
$year = 2007;
printf("ZIP is %05d and the date is %02d/%02d/%d", $zip, $month, $day, $year);
?>

</source>

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в 10:37, 26 мая 2010

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