Php Lowercase

Generate a random string, including uppercase and lowercase letters and numbers. Function randstr ($ length) {$ hash = ''; $ chars = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz'; $ max = strlen ($ chars) - 1; mt _...

In this lesson, we want to learn how to increase the intelligent processing capacity of the Web page. Basic functions Welcome to the third and final lesson of this tutorial. If you've learned the first and second lessons, you've mastered the basics of installing and programming MySQL and PHP. Here are some of the other functions of PHP that might be useful to you and make your development process simpler. 　　First, let's look at the document. You should know some basic concepts of the header file, right? The header file is an external file whose contents are included in the main program. ...

It would be faster to enclose the string in single quotes instead of double quotes. Because PHP searches for variables in double-quoted strings, single quotes do not. Note that only echo can do this: it's a "function" that takes multiple strings as arguments, Echo is a language structure, not a real function, so the function with double quotes). 1, if you can define the class method as static, as far as the definition of static, it will speed up nearly 4 times. 2, $ row ['id'] speed ...

As PHP programmers, especially novices, always know too little about the dangers of the Internet, for many of the external invasion are at a loss what to do, they do not know how hackers invaded, submitted to the invasion, upload vulnerabilities, sql Injection, cross-scripting and more. As a basic precaution you need to be aware of your external commits and do a good job with the first side of the security mechanism to handle the firewall. Rule 1: Never trust external data or enter information about Web application security, the first thing you must recognize is that you should not trust external data. External data (outside d ...

In PHP to generate a CAPTCHA image is quite simple, because in PHP for us to provide a graphics Gd.dll library, to enable the GD graphics library we just php.ini in the PHP-GD front; Method a $authnum = '; $ychar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z&qu ...

Php_sapi_http://www.aliyun.com/zixun/aggregation/11696.html ">name (PHP4 >= 4.0.1) php_sapi_name--- Returns the interface syntax between Web servo and PHP: String php_sapi_name (void) Description: Php_sapi_name () returns a lowercase ...

This is a use mysql php instance user registration code, is relatively simple, is to submit the html data submitted to the mysql database tutorial. * / include ('global.php'); if ($ _ post ['sub']) {$ user = $ _post ['username']; $ pwd = md5 ($ _ post ['p ...

PHP Tutorial to judge the file types of uploaded files a variety of instance code $array = Array (' jpg ', ' gif ', ' PNG ', ' jpeg '); $PICIMG = '/upfile/upload_pic/thumbnail_1258615556.jpg '; $img = Strtolower ($PICIMG); Get file name extension method One $ext = substr ($img, Strrpos ($img, ' ...

PHP tutorial Gets the current URL domain name instance code function getServerName () {$ServerName = Strtolower ($_server[' server_name ']?$_server["Server_   NAME ']:$_server[' http_host ']); if (Strpos $ServerN ...

AddSlashes: String added to the slash. bin2hex: binary into hexadecimal. Chop: Remove continuous blanks. Chr: returns the ordinal value of the character. chunk_split: The string is divided into small pieces. convert_cyr_string: Converts the ancient Slavonic string into another string. crypt: Encrypt the string with DES encoding. echo: output string. explode: cut the string. flush: clear the output buffer. ...