How to escape sprintf function in php

In PHP, the sprintf function can write the formatted string into a variable for escape. The syntax is "sprintf(format, which stipulates that it is inserted into the first % symbol in the format string. Parameters, specify the parameters inserted at the second % symbol in the format string,...)", where format is used to specify the string and how to format the variables in it.

The operating environment of this article: Windows 10 system, PHP version 8.1, Dell G3 computer

How to escape the sprintf function in php

sprintf() function writes a formatted string into a variable.

arg1, arg2, parameters will be inserted into the main string at the percent sign (%) symbol. This function is executed step by step. At the first % sign, insert arg1, at the second % sign, arg2, 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 "\$".

The syntax is:

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

format required. Specifies a string and how to format variables within it.

Possible format values:

• ##%% - Returns a percent sign %

• %b - Binary number

• %c - the character corresponding to the ASCII value

• %d - the decimal number containing the sign (negative, 0, positive)

• %e - Use lowercase scientific notation (e.g. 1.2e 2)

• %E - Use uppercase scientific notation (e.g. 1.2 E 2)

• %u - Decimal number without sign (greater than or equal to 0)

• %f - Floating point number (local settings)

• %F - Floating point number (non-native settings)

##%g - Shorter %e and %f
%G - shorter %E and %f

• ##%o - octal number

• %s - String

• %x - Hexadecimal number (lowercase letters)

• %X - Hexadecimal number (uppercase letters)

• Additional format value. Must be placed between % and a letter (such as %.2f):
• (Add or - in front of the number to define the sign of the number. Default In this case, only negative numbers are marked, positive numbers are not marked)

• ' (Specifies what to use as padding, the default is spaces. It must be used with the width specifier. For example: %'x20s (use "x" as padding))

• - (left adjust variable value)

• [0-9] (specify The minimum width of the variable value)

• .[0-9] (Specifies the number of decimal places or the maximum string length)

• Note: If When using multiple above format values, they must be used in the order above and cannot be disrupted.

arg1 Required. Specifies the parameters to be inserted at the first % sign in the format string.

arg2 Optional. Specifies the parameter to be inserted into the format string at the second % sign.

arg Optional. Specifies the parameters to be inserted into the format string at the third, fourth, etc. % symbols.

The example is as follows:

<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // ASCII 字符 50 是 2
 
// 注释：格式值 "%%" 返回百分号
echo sprintf("%%b = %b",$num1)."<br>"; // 二进制数
echo sprintf("%%c = %c",$char)."<br>"; // ASCII 字符
echo sprintf("%%d = %d",$num1)."<br>"; // 带符号的十进制数
echo sprintf("%%d = %d",$num2)."<br>"; // 带符号的十进制数
echo sprintf("%%e = %e",$num1)."<br>"; // 科学计数法（小写）
echo sprintf("%%E = %E",$num1)."<br>"; // 科学计数法（大写）
echo sprintf("%%u = %u",$num1)."<br>"; // 不带符号的十进制数（正）
echo sprintf("%%u = %u",$num2)."<br>"; // 不带符号的十进制数（负）
echo sprintf("%%f = %f",$num1)."<br>"; // 浮点数（视本地设置）
echo sprintf("%%F = %F",$num1)."<br>"; // 浮点数（不视本地设置）
echo sprintf("%%g = %g",$num1)."<br>"; // 短于 %e 和 %f
echo sprintf("%%G = %G",$num1)."<br>"; // 短于 %E 和 %f
echo sprintf("%%o = %o",$num1)."<br>"; // 八进制数
echo sprintf("%%s = %s",$num1)."<br>"; // 字符串
echo sprintf("%%x = %x",$num1)."<br>"; // 十六进制数（小写）
echo sprintf("%%X = %X",$num1)."<br>"; // 十六进制数（大写）
echo sprintf("%%+d = %+d",$num1)."<br>"; // 符号说明符（正）
echo sprintf("%%+d = %+d",$num2)."<br>"; // 符号说明符（负）
?>

Output result:

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