输出格式化的字符串:
<?php
$number = 9;
$str = "Beijing";
vprintf("There are %u million bicycles in %s.",array($number,$str));
?>
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vprintf() 函数输出格式化字符串。
与 printf() 不同,vprintf() 中的参数放置在一个数组中。数组元素将插入到主字符串中的百分号 (%) 处。此功能有效"step-by-step"。在第一个 % 符号处,插入第一个数组元素,在第二个 % 符号处,插入第二个数组元素,依此类推。
笔记:如果 % 符号多于参数,则必须使用占位符。占位符插入到 % 符号之后,由参数数字和 "\$" 组成。参见示例二。
提示:相关功能:sprintf(),打印(),vsprintf(),fprintf()和vfprintf()
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 |
返回值: | 返回输出字符串的长度 |
---|---|
PHP 版本: | 4.1.0+ |
占位符的使用:
<?php
$number = 123;
vprintf("With 2 decimals: %1\$.2f
<br>With no decimals: %1\$u",array($number));
?>
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使用 printf() 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)
?>
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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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