PHP vprintf () function
Examples
Output formatted strings:
$number = 9;
$str = "Beijing";
vprintf("There are %u million bicycles in %s.",array($number,$str));
?>
Running instance »
Definition and Usage
() Function outputs a string formatted vprintf.
And printf () different, vprintf () parameters are located in the array. Array element will be inserted into the main string percent sign (%) sign at. This function is performed on. In the first place a% sign, the first array element is inserted in the second% sign at the insertion of the second array element, and so on.
Note: If the% symbol than arg parameter, you must use placeholders.After placeholder is inserted into the% symbol, numbers and "\ $" component. See Example 2.
Tip: correlation function: sprintf () , the printf () , vsprintf () , fprintf () and vfprintf ()
grammar
参数 | 描述 |
---|---|
format | 必需。规定字符串以及如何格式化其中的变量。 可能的格式值:
附加的格式值。必需放置在 % 和字母之间(例如 %.2f):
注释:如果使用多个上述的格式值,它们必须按照上面的顺序进行使用,不能打乱。 |
argarray | 必需。带有参数的一个数组,这些参数会被插到 format 字符串中的 % 符号处。 |
technical details
return value: | It returns the length of the string to be output. |
---|---|
PHP version: | 4.1.0+ |
More examples
Example 1
Use the format value% f:
$num1 = 123;
$num2 = 456;
vprintf("%f%f",array($num1,$num2));
?>
Running instance »
Example 2
Use placeholders:
$number = 123;
vprintf("With 2 decimals: %1$.2f
<br>With no decimals: %1$u",array($number));
?>
Running instance »
Example 3
Using printf () to demonstrate the value of all the possible formats:
$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)
?>
Running instance »
Example 4
String specifiers presentation:
$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));
?>
Running instance »
PHP String Reference