Definition and usage of sprintf in php_PHP tutorial

The sprintf() function is used to write a formatted string into a variable. ​

Definition and usage
The sprintf() function is used to write a formatted string into a variable.

Grammar
sprintf(format,arg1,arg2,arg++) parameter description
format required. Convert format.
arg1 required. Specifies the parameter 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.

Description
The format parameter is the format of the conversion, starting with the percent sign ("%") and ending with the conversion character. Possible format values ​​below:

•%% - Returns the percent symbol
•%b - binary number
•%c - character
according to ASCII value •%d - signed decimal number
•%e - Continuous counting method (e.g. 1.5e+3)
•%u - unsigned decimal number
•%f - floating point number (local settings aware)
•%F - floating point number (not local settings aware)
•%o - octal number
•%s - string
•%x - Hexadecimal number (lowercase letters)
•%X - Hexadecimal number (capital letters)
Arguments arg1, arg2, ++, etc. are 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, insert arg2, and so on

Tips and Notes
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 3.

Example
Example 1

代码如下	复制代码
?

Output:

?Hello world. Day number 123
Example 2

代码如下	复制代码
?

​

Output:

?123.000000
Example 3

The code is as follows

Copy code

?With no decimals: %1$u",$number); echo $txt; ?>

代码如下	复制代码
?With no decimals: %1$u",$number); echo $txt; ?>

​

Output:

?With 2 decimals: 123.00 With no decimals: 123
Example 4

The code is as follows

Copy code

代码如下	复制代码
? 输出： ?application/pdf

? Output: ?application/pdf

http://www.bkjia.com/PHPjc/445309.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445309.htmlTechArticle The sprintf() function is used to write a formatted string into a variable. Definition and Usage The sprintf() function is used to write a formatted string into a variable. Syntax sprintf(format,a...