PHP fprint()用法及代码示例

PHP fprint() 函数用于将格式化的字符串写入流。换句话说，我们可以说这个函数将字符串格式化为指定的输出流(文件或数据库)。

用法:

fprintf(stream,format,arg1,arg2,arg++)

参数	描述	必需/可选
stream	指定字符串写入/输出字符串的位置	Required
Format	指定字符串。	Required
arg1	首先指定要插入的参数。	required
arg2	指定要在第二个插入的参数。	Optional
参数++	指定要在第三个、第四个等处插入的参数。	Optional

例子1

<?php
$number = 9;
$str = "javatpoint";
$file = fopen("test.txt","w");
echo fprintf($file,"There are %u million bicycles in %s.",$number,$str);
?>

输出：

例子2

<?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)
?>

输出：

%b = 111010110111100110100010101 
%c = 2 
%d = 123456789 
%d = -123456789 
%e = 1.234568e+8 
%E = 1.234568E+8

例子3

<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // The ASCII Character 50 is 2
// Note:The format value "%%" returns a percent sign
printf("%%u = %u <br>",$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
?>

输出：

%u = 123456789 
%u = 4171510507 
%f = 123456789.000000 
%F = 123456789.000000 
%g = 1.23457e+8 
%G = 1.23457E+8 
%o = 726746425

示例 4

<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // The ASCII Character 50 is 2
printf("%%s = %s <br>",$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)*/
?>

输出：

%s = 123456789 
%x = 75bcd15 
%X = 75BCD15 
%+d = +123456789 
%+d = -123456789

相关用法

注：本文由纯净天空筛选整理自 PHP fprint() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。