PHP

This article introduces an example program for adding a php two-dimensional array to a group by one click. If you want to retrieve data from the database, you can select sum (t_value ), t_id FROM t_table group by t_id, but it is a little troublesome

Sometimes the following warning occurs when writing a php program: PHP Warning: date (): It is not safe to rely on the system's timezone settings. you are * required * to use the date. timezone setting or the date_default_timezone_set () function.

Php code: key = $ key; if ($ iv = 0) {$ this-> iv = $ key;} else {$ this-> iv = $ iv ;}} // encryption function encrypt ($ str) {$ size = mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC); $ str = $ this-> pkcs5Pad ($ str, $ size ); $ data =

In a 32-bit system, ip2long cannot be converted to IPv6, but you can convert ip2bin and bin2ip. This function is converted to IPv4 and IPv6, and false is returned. if it is invalid, the instance program: & lt ;? Phpfunctionip In a 32-bit system,

There are many ways to convert html tags into plain text in php. for example, if php comes with the strip_tags function, it can directly convert html into plain text format, next I will take a look at the various There are many ways to convert html

In php, the session times out in 30 minutes by default, but sometimes it automatically times out in less than 30 minutes. this is inconvenient for many operations. let's take a look at the solution to the 30-minute timeout. In php, the session times

Session_start (): enable the session mechanism. call session_register (): register the session variable session_unregister () at the beginning of the program file that requires the session (): Session_start (): Enables the session mechanism and

Object-oriented design is a very important part in php program development. if you want to become a senior php programmer, we must know the specific usage and maintenance of object-oriented design. simple modularization Object-oriented design is a

A simple article on PHP object-oriented concepts and examples can be used as a reference for anyone who needs it. Keywords and special variables, new, class, extends. All three of them know A simple article on PHP object-oriented concepts and

In php, arrays are a very important data type. they can store different types of data. compared with other simple integer types, arrays can only store a single data type, which is much better. next I will introduce php Data In php, arrays are a very

I. no proxy server is used: REMOTE_ADDR your IPHTTP_VIA has no value or does not show HTTP_X_FORWARDED_FOR has no value or does not show 2. Transparent use I. no proxy server is used: REMOTE_ADDR = your IP address HTTP_VIA = no value or no

_ FILE __: a PHP magic constant. it returns the complete path and FILE name of the current PHP script, including an absolute path 1) dirname (_ FILE __) the function returns the path where the script is located. _ FILE __: a PHP magic constant. it

In php, the 301 redirection implementation method is very simple. we only need to simply use the header to send the 301 status code and then use the header to jump. The effect is the same as that of apache, iis, and nginx. In php, the 301

In php, to determine the browser type, the operation method is very simple. we only need to use the global variable HTTP_USER_AGENT to obtain the user's browser information, so that we can use regular expressions In php, if you want to determine the

In php, there are several forms to submit data. one is post and get. next I will introduce php beginners in detail how to use get and post to receive data submitted by forms, friends who need to know In php, there are several forms to submit data.

This article will introduce the code for php to obtain the checkbox form value. if you need to know more about it, you can refer to it. because the checkbox owner is different from the input, it is special here. This article introduces the code for

Below I have summarized some character replacement methods in php development, including direct replacement without regular expressions or replacement with regular expressions, and replacement using php built-in functions. For example, there is a

PHP is a weak type. when using PHP, you do not need to define the type of a variable. you can use it to define the type of a variable. In PHP, variable types are determined by the values assigned to them. If the value assigned is an integer PHP is a

Include () or require () functions. you can insert the content of a file into the file before the server executes the php file. apart from the different ways in which they handle errors, these two functions are the same in other aspects. the include

$ Hostname & quot; localhost & quot; defines the name of the connected mysql server $ username & quot; root & quot; and defines the username $ password & quot; for connection ;; define the password for connection $ linkmys $ Hostname =