Detailed explanation of how to use PHP sprintf() function

Detailed explanation of how to use PHP sprintf() function_PHP tutorial

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Release： 2016-07-13 17:15:00

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We know that the sprintf() function writes a formatted string into a variable. We often see this type of code. Let me introduce how to use the sprintf() function. Friends in need can refer to it. .

Usage

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

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, arg1 is inserted, at the second % sign, arg2, and so on.

I will see the following code on the WeChat open platform

代码如下

复制代码

$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
                $fromUsername = $postObj->FromUserName;
                $toUsername = $postObj->ToUserName;
                $keyword = trim($postObj->Content);
                $time = time();
    $msgType = "text";
                $textTpl = "


       %s


       0
       ";
    if(!empty( $keyword ))
                {

                $contentStr = $this->keyrep($keyword);
     if( empty($contentStr) )
     {
      $contentStr ="你是故意的吧，没文化真可怕";//你是故意的吧，没文化真可怕;
     }
     //$contentStr = @iconv('UTF-8','gb2312',$keyword);
                $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;

                }else{
                $contentStr = '没文化真可怕，居然不会打字！';//$this->keyrep($keyword);
                //$contentStr = @iconv('UTF-8','gb2312',$keyword);
     $resultStr = sprintf($textTpl, $fromUsername, $toUsername, $time, $msgType, $contentStr);
                echo $resultStr;
                }

What is used above is in xml. Let’s look at another example written by a netizen

The code is as follows

Copy code

/**
* Use sprintf() function
* * @date 2012-12-17
* * @author cntnn11
*/
/**
* Manual definition: The function writes a formatted string into a variable.
* His recognizable format
* %% - Returns the percent symbol
*** * %C -character according to the ASCII value
; * %E -Science Counting Method (such as 1.5E+3)
* . *** *** *** *** *** *** * sprintf($str, arg1, arg2, arg3...);
*/

/**
* 1. %%
* Replace %% with %
*/
$testStr = 'Test the %% parameter. What will it be replaced with?';
echo sprintf($testStr),'
';
//-> Test the % parameter. What will it be replaced with?
//Only one% left
//It seems that it really just returns a ‘%’. But how to use it in practical applications?
//I don’t know either~
echo '

';
/**
* 2. %b
* This parameter can only replace integer data. If it is a floating point type, then it will only take the integer part. decimal points will be ignored
* If it is a non-integer data, then return 0
*/
$testStr = 'I heard that %b will be replaced with a binary number, is it true? ';
$arg = '10';
echo sprintf($testStr, $arg),'
';
//-> 1010; $arg=10; Really replaced!
//-> 101; $arg=4.5
//-> 0; $arg=str/bool...
echo '

';

/**
* 3. %c returns the ASCII code of the character encoding
* TIP: [He does not return ASCII code]
* $arg accepts an int, that is, an ASCII numeric value, and then returns the character corresponding to the value
*/
$testStr = 'Let's test %c: see if it can return ASCII code';
$arg = '122';
echo sprintf($testStr, $arg);
//-> A; $arg=65;
//-> z; $arg=122
echo '

';
/**
* 4. %d replaces %d in a character with int type
* TIP: This can be any int type.
* If it is a floating point data, only the integer part will be replaced
* If it is non-numeric, it will be replaced with 0
*/
$testStr = "This is an ID, the ID number is %d,";
$arg = '-4';
echo sprintf($testStr, $arg);
//-> 4; $arg=4.5
//-> 0; $arg=[a-zA-Zs];
echo '

';

/**
* 5. %e Scientific notation
* TIP: Present a very long integer data in scientific notation
* Same as %d, this function will also ignore the decimal point and replace any non-numeric data with 0
*/
$testStr = "I am very long, with more than N digits... %e";
$arg = '46498464654864564642449463699789789313';
echo sprintf($testStr, $arg);
//-> 4.649846e+14; $arg=464984646548645.64642449463699789789313
//-> 0.000000e+0; $arg=asdfasdf;
echo '

';

/**
* 5. %u - unsigned decimal number
* not understand. . . If it is a negative number, I don’t know what its value is
*/
$testStr = "I am an unsigned decimal number... %u";
$arg = '456';
echo sprintf($testStr, $arg);
echo '

';

/**
* 6. %f - floating point number (local settings aware)
* Is it the opposite of %d?
* This will return a floating point number, and there are only 6 fixed digits after the decimal point
* The string is also 0;
*/
$testStr = "What is the difference from that d? %f";
$arg = '456.235645';
echo sprintf($testStr, $arg);
echo '

';

/**
* 7. %F - floating point number (not local settings aware)
* Is it the opposite of %f? Why is it no different from small f? No way
*/
$testStr = "What is the difference between it and the lowercase f? %F";
$arg = '12312316.46898';
echo sprintf($testStr, $arg);
echo '

';

/**
* 8. %o - Octal number
* Same as %d. It’s just that the parameter is passed in an octal value
*/
$testStr = "Replace octal number with decimal %o";
$arg = '8';
echo sprintf($testStr, $arg);
echo '

';

/**
* 9. %x - Hexadecimal number (lowercase letters)
* Same as %d/%o. It’s just that the parameter is passed in a hexadecimal value with lowercase letters
*/
$testStr = "Replace hexadecimal number with decimal %o";
$arg = '456d12';
echo sprintf($testStr, $arg);
echo '

';

/**
* 10. %X - Hexadecimal number (uppercase letters)
* Same as %d/%o/%x. It’s just that the parameter is passed in a hexadecimal value with uppercase letters
* It seems that there is no difference between the upper and lower case letters of %x %X...
*/
$testStr = "Replace uppercase hexadecimal numbers with decimal %o";
$arg = '456D12';
echo sprintf($testStr, $arg);
echo '

';

/**
* 11. %s - String
* Replace %s
with the string you passed in */
$string = "This is the sprintf string (%s) used for testing. I spent %f yuan today. There are %d stations from Xierqi to Zhichun Road. Go to work";
$arg = '';
echo sprintf($string, $arg, 234, 10);
echo '

';

?>