PHP sprintf() 函数

❮ PHP 字符串参考

示例

将百分号 (%) 替换为作为参数传递的变量：

<?php
$number = 9;
$str = "Beijing";
$txt = sprintf("There are %u million bicycles in %s.",$number,$str);
echo $txt;
?>

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定义和用法

sprintf() 函数将格式化字符串写入变量。

arg1、arg2、++ 参数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 arg1，在第二个 % 符号处插入 arg2，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：打印（）,vprintf(),vsprintf(),fprintf()和vfprintf()

语法

sprintf( format,arg1,arg2,arg++)

参数值

Parameter	Description
format	Required. Specifies the string and how to format the variables in it. Possible format values: %% - Returns a percent sign %b - Binary number %c - The character according to the ASCII value %d - Signed decimal number (negative, zero or positive) %e - Scientific notation using a lowercase (e.g. 1.2e+2) %E - Scientific notation using a uppercase (e.g. 1.2E+2) %u - Unsigned decimal number (equal to or greater than zero) %f - Floating-point number (local settings aware) %F - Floating-point number (not local settings aware) %g - shorter of %e and %f %G - shorter of %E and %f %o - Octal number %s - String %x - Hexadecimal number (lowercase letters) %X - Hexadecimal number (uppercase letters) Additional format values. These are placed between the % and the letter (example %.2f): + (Forces both + and - in front of numbers. By default, only negative numbers are marked) ' (Specifies what to use as padding. Default is space. Must be used together with the width specifier. Example: %'x20s (this uses "x" as padding) - (Left-justifies the variable value) [0-9] (Specifies the minimum width held of to the variable value) .[0-9] (Specifies the number of decimal digits or maximum string length) Note: If multiple additional format values are used, they must be in the same order as above.
arg1	Required. The argument to be inserted at the first %-sign in the format string
arg2	Optional. The argument to be inserted at the second %-sign in the format string
arg++	Optional. The argument to be inserted at the third, fourth, etc. %-sign in the format string

技术细节

返回值：	返回格式化的字符串
PHP 版本：	4+

更多示例

示例

使用格式值 %f：

<?php
$number = 123;
$txt = sprintf("%f",$number);
echo $txt;
?>

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示例

占位符的使用：

<?php
$number = 123;
$txt = sprintf("With 2 decimals: %1\$.2f
 With no decimals: %1\$u",$number);
echo $txt;
?>

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示例

所有可能的格式值的演示：

<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // The ASCII Character 50 is 2

// Note: The format value "%%" returns a percent sign
echo sprintf("%%b = %b",$num1)." "; // Binary number
echo sprintf("%%c = %c",$char)." "; // The ASCII Character
echo sprintf("%%d = %d",$num1)." "; // Signed decimal number
echo sprintf("%%d = %d",$num2)." "; // Signed decimal number
echo sprintf("%%e = %e",$num1)." "; // Scientific notation (lowercase)
echo sprintf("%%E = %E",$num1)." "; // Scientific notation (uppercase)
echo sprintf("%%u = %u",$num1)." "; // Unsigned decimal number (positive)
echo sprintf("%%u = %u",$num2)." "; // Unsigned decimal number (negative)
echo sprintf("%%f = %f",$num1)." "; // Floating-point number (local settings aware)
echo sprintf("%%F = %F",$num1)." "; // Floating-point number (not local sett aware)
echo sprintf("%%g = %g",$num1)." "; // Shorter of %e and %f
echo sprintf("%%G = %G",$num1)." "; // Shorter of %E and %f
echo sprintf("%%o = %o",$num1)." "; // Octal number
echo sprintf("%%s = %s",$num1)." "; // String
echo sprintf("%%x = %x",$num1)." "; // Hexadecimal number (lowercase)
echo sprintf("%%X = %X",$num1)." "; // Hexadecimal number (uppercase)
echo sprintf("%%+d = %+d",$num1)." "; // Sign specifier (positive)
echo sprintf("%%+d = %+d",$num2)." "; // Sign specifier (negative)
?>

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示例

字符串说明符的演示：

<?php
$str1 = "Hello";
$str2 = "Hello world!";

echo sprintf("[%s]",$str1)." ";
echo sprintf("[%8s]",$str1)." ";
echo sprintf("[%-8s]",$str1)." ";
echo sprintf("[%08s]",$str1)." ";
echo sprintf("[%'*8s]",$str1)." ";
echo sprintf("[%8.8s]",$str2)." ";
?>

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❮ PHP 字符串参考