Home > Article > Backend Development > PHP function vprintf() that outputs formatted strings
Example
Output a formatted string:
<?php $number = 9; $str = "Beijing"; vprintf("There are %u million bicycles in %s.",array($number,$str)); ?>
Definition and usage
The vprintf() function outputs a formatted string.
Unlike printf(), the parameters in vprintf() are located in an array. Array elements will be inserted into the main string at the percent sign (%). 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 % symbols than arg arguments, you must use placeholders. The placeholder is inserted after the % symbol and consists of a number and "\$". See Example 2.
Tips: Related functions: sprintf(), printf(), vsprintf(), fprintf() and vfprintf()
Syntax
vprintf(format,argarray)
Parameters | Description | ||||
format | Required. Specifies a string and how to format variables within it. Possible format values:
+ (Add + or - in front of a number to define the sign of the number. By default, only Negative numbers are marked, positive numbers are not marked)
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技术细节
更多实例 实例 1 使用格式值 %f: <?php $num1 = 123; $num2 = 456; vprintf("%f%f",array($num1,$num2)); ?> 实例 2 使用占位符: <?php $number = 123; vprintf("With 2 decimals: %1$.2f <br>With no decimals: %1$u",array($number)); ?> 实例 3 使用 printf() 来演示所有可能的格式值: <?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) ?> 实例 4 字符串说明符的演示: <?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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