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

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

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$postObj = simplexml_load_string($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

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/** * 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 ' '; ?>

http://www.bkjia.com/PHPjc/628892.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/628892.htmlTechArticleWe 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 sprintf() function, friends in need...