convert letters to numbers

So we know that simple four-digit pure digital verification in PHP can be done with Rand (1000,9999), but if we're going to get a random four-digit number of letters and numbers, how do we write a function? The following Hu Peng blog in the PHP data column gives a complete example. "W", "X", "Y", "Z", "A", "B", "C", "D", "E", "F", "G", " H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",

In the company's development of WinForm projects, found that the company's self-developed TextBox control is very powerful, you can achieve "only number", "Only the letter" and "only enter numbers and letters," the three kinds of input restrictions, so you can accurately control the user input range, so that " Users will never be able to enter content other than the limits of content ", that is," users do n

Regular expression: checks that a string contains only numbers, letters, underscores, and Chinese characters (RT ). To verify the user name, it only contains numbers, letters, underscores, and Chinese characters. it must be tested even if the order is disordered. Reply to discussion (solution) Rule string:/^ \

Common HTML Regular Expressions1. Only numbers and English letters can be entered:Copy codeThe Code is as follows:Onbeforepaste = "clipboardData. setData ('text', clipboardData. getData ('text'). replace (/[^/d]/g ,''))"ID = "Text1" NAME = "Text1"> 2. Only numbers can be entered:Copy codeThe Code is as follows:Onbeforepaste = "clipboardData. setData ('text', clip

PHP methods for obtaining random numbers and letters Method 1 $ FileID = date ("Ymd-His"). '-'. rand (100,999 ); // $ FileID is a random number such as 20100903-132121-908 ?> Method 2 Function randomkeys ($ length ){$ ReturnStr = '';$ Pattern = '1234567890abcdefghijklmnopqrstuvwxyzabcdefghijklomnopqrstuvwxyz ';For ($ I = 0; $ I $ ReturnStr. = $ pattern {mt_rand (0, 61)}; // Generate a php rand

PHP methods to obtain random numbers and letters. The first method? Php $ FileIDdate (Ymd-His).-. rand (100,999); $ FileID is a random number like 20100903-132121-908? Method 2? Phpfunctionrandomkeys ($ length) {$ returnS First method $ FileID = date ("Ymd-His"). '-'. rand (100,999 ); // $ FileID is a random number such as 20100903-132121-908 ?> Method 2 Function randomkeys ($ length ){ $

Friends who are experienced in web development will strictly verify the forms entered by users. I would like to share with you some experience in Form Verification, how to use JavaScript to restrict the input box to only English letters and numbers, not Chinese and other special characters. For more information, see the following code! The following describes the common events of onkeypress, onkeyup, and o

JavaScript's own approach to mixed sorting of numbers \ Letters and Chinese (purely research, not practical) prefaceIn the previous blog post, "the sort method of JavaScript array sorting and the learning summary of self-implementing sorting methods", I implemented the sorting of digital arrays in my own way.Of course, in practical use, I will still use the sort method more convenient. However, my last blog

Converts Chinese characters to pinyin and uppercase letters of each Chinese character, such as dalian. I convert them to dalian, and convert them to D and l to L, in addition, other letters are shared in lower case: more -- convert Chinese characters into pinyin, and make th

1. Only numbers can be entered in the text boxCode(Decimal point cannot be entered) 2. Only numbers can be entered, and decimal points can be entered. 3. Number and decimal point method 2 4. Only letters and Chinese characters can be entered 5. Only English letters and numbe