PHP vprintf()Functions
Examples
Output a formatted string:
$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(), vprintf()'s parameters are placed in an array. Array elements are inserted at the percent (%) signs in the main string. This function is executed step by step. At the first % sign, the first array element is inserted, at the second % sign, the second array element is inserted, and so on.
Note:If there are more % signs than arg parameters, you must use placeholders. The placeholder is inserted after the % sign and consists of a number and "\$". See Example 2.
Tip:Related functions:sprintf()、 printf()、 vsprintf()、 fprintf()andvfprintf()
Syntax
| Parameters | Description |
|---|---|
| format | Required. Specifies the string and how to format the variables in it. Possible format values:
Additional format values. Must be placed between % and the letter (e.g. %.2f):
Note:If multiple format values above are used, they must be used in the order above and cannot be rearranged. |
| argarray | Required. An array with arguments that will be inserted at the % signs in the format string. |
Technical Details
| Return value: | Returns the length of the output string. |
|---|---|
| PHP version: | 4.1.0+ |
More Examples
Example 1
Using format value %f:
$num1 = 123;
$num2 = 456;
vprintf("%f%f",array($num1,$num2));
?>
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Example 2
Using placeholders:
$number = 123;
vprintf("With 2 decimals: %1$.2f
<br>With no decimals: %1$u",array($number));
?>
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Example 3
Use printf() to demonstrate all possible format values:
$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
Demonstration of string specifiers:
$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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