PHP vprintf() Function
Example
Output a formatted string:
<?php
$number = 9;
$str = "Beijing";
vprintf("There are %u million
bicycles in %s.",array($number,$str));
?>
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Definition and Usage
The vprintf() function outputs a formatted string.
Unlike printf(), the arguments in vprintf(), are placed in an array. The array elements will be inserted at the percent (%) signs in the main string. This function works "step-by-step". At the first % sign, the first array element is inserted, at the second % sign, the second array element is inserted, etc.
Note: If there are more % signs than arguments, you must use placeholders. A placeholder is inserted after the % sign, and consists of the argument- number and "\$". See example two.
Tip: Related functions: sprintf(), printf(), vsprintf(), fprintf() and vfprintf()
Syntax
vprintf(format,argarray)
| Parameter | Description |
|---|---|
| format | Required. Specifies the string and how to format the
variables in it. Possible format values:
Additional format values. These are placed between the % and the letter (example %.2f):
Note: If multiple additional format values are used, they must be in the same order as above. |
| argarray | Required. An array with arguments to be inserted at the % signs in the format string |
Technical Details
| Return Value: | Returns the length of the outputted string |
|---|---|
| PHP Version: | 4.1.0+ |
More Examples
Example 1
Using the format value %f:
<?php
$num1 = 123;
$num2 = 456;
vprintf("%f%f",array($num1,$num2));
?>
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Example 2
Use of placeholders:
<?php
$number = 123;
vprintf("With 2 decimals: %1\$.2f
<br>With no decimals: %1\$u",array($number));
?>
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Example 3
Using printf() to demonstrate all possible format values:
<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // The
ASCII Character 50 is 2
// Note: The format value "%%" returns a
percent sign
printf("%%b = %b <br>",$num1); // Binary number
printf("%%c
= %c <br>",$char); // The ASCII Character
printf("%%d = %d <br>",$num1);
// Signed decimal number
printf("%%d = %d <br>",$num2); // Signed decimal
number
printf("%%e = %e <br>",$num1); // Scientific notation (lowercase)
printf("%%E = %E <br>",$num1); // Scientific notation (uppercase)
printf("%%u
= %u <br>",$num1); // Unsigned decimal number (positive)
printf("%%u = %u
<br>",$num2); // Unsigned decimal number (negative)
printf("%%f = %f <br>",$num1);
// Floating-point number (local settings aware)
printf("%%F = %F <br>",$num1);
// Floating-point number (not local settings aware)
printf("%%g = %g <br>",$num1);
// Shorter of %e and %f
printf("%%G = %G <br>",$num1); // Shorter of %E
and %f
printf("%%o = %o <br>",$num1); // Octal number
printf("%%s = %s
<br>",$num1); // String
printf("%%x = %x <br>",$num1); // Hexadecimal
number (lowercase)
printf("%%X = %X <br>",$num1); // Hexadecimal number
(uppercase)
printf("%%+d = %+d <br>",$num1); // Sign specifier (positive)
printf("%%+d = %+d <br>",$num2); // Sign specifier (negative)
?>
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Example 4
A demonstration of string specifiers:
<?php
$str1 = "Hello";
$str2 = "Hello world!";
vprintf("[%s]<br>",array($str1));
vprintf("[%8s]<br>",array($str1));
vprintf("[%-8s]<br>",array($str1));
vprintf("[%08s]<br>",array($str1));
vprintf("[%'*8s]<br>",array($str1));
vprintf("[%8.8s]<br>",array($str2));
?>
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PHP String Reference
