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How to dialyze PHP configuration file php.ini, aiming at this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

The PHP.INI file, which was named PHP3.INI in the previous version of PHP, PHP3.0, is no stranger to every PHP enthusiast. Open it with NOTEPAD, and the files are usually in the operating system's Windows directory. The following editor to explain how to dialysis PHP configuration file php.ini?

How to analyze the configuration file php.ini of PHP

As you can see, there are many semicolons in the PHP.INI file. Like the Windows system, these semicolons are used to express comments, that is to say, in order to make the configuration file clear and easy to understand, developers make a brief description of each configuration function after the semicolon, and the system will ignore these comment lines when processing. Of course, another advantage is that when the configuration of the PHP system changes, we can just add or remove comments on some lines, which is simple and square.

It's convenient.

Auto_prepend_filestring can specify that a file is automatically parsed and executed before all php files are read, and can be any file such as PHP, ASP, HTML, etc. (but not image files), which is useful in special cases. For example, if you want to add an advertisement to each PHP page, and suppose you are developing a website that wants all visitors to authenticate before reading any PHP page, you can make your verification code into a separate file, and then set string to the file name here. Careful readers want to ask: what if I only need these functions in some files? use your head, for example:

Myprefix.php file

If (strstr (strtoupper (PHP_SELF), "/ PHPTEST/"))

Echo "my ad!"

"

? >

So as long as you set: auto_prepend_file= "myprefix.php", then all the PHP files in the phptest directory will contain your ad header! It is also important to note that this file should be placed in the path referred to by include_path, otherwise it may go wrong, which will be mentioned below.

Auto_append_filestring is similar to the above, except that it is automatically added to the end of the PHP file, and it doesn't work when the PHP program exits with exit (). With this feature, we can easily add footnotes to the company address!

The function of the parameter include_pathstring is to let include (), require (), and other functions look for files in the path defined here, isn't it a bit like the SETPATH command used in the DOS era? This parameter can provide a list of paths, but paths are separated by colons in UNIX, semicolons are used in NT, and the direction of the slash is different. Such as:

UNIX example: include_path=.:/home/lib

NT example: include_path= ".: c:homeib" of which "." Represents the current directory.

Gpc_orderstring

GPC is the first letter of the three GET/POST/COOKIE variables, its order reflects the priority of the system to deal with the three variables, from left to right, the priority increases sequentially. The default setting is GPC, so that when any two or three variables with the same name are passed to the server, the system sorts by priority and reads only the variables with higher priority. For example, setting it to "GP" means ignoring cookie and replacing GET with POST when the access method (method) is the same. Of course, in the process of programming, we should try to avoid passing variables with the same name in different ways at the same time, otherwise the readability of the program will become worse, and there may be different output results in different configurations.

The parameter magic_quotes_gpcboolean determines the special characters contained in the three GET/POST/COOKIE variables: single quotation marks, double quotes, slashes, and whether to add the escape character backslash (the "commonly used in C)? Because in systems such as PHP databases, characters such as single quotation marks usually have a special meaning, in order to distinguish them from real characters, we can set magic_quotes_gpc=on so that if we have single quotation marks in the variables we get from the client, we will precede the escape character, and then we can use the function stripslashes (stringstr) as needed; (this function removes the backslash escape character from the string. If there are two consecutive backslashes, remove one and leave one. If there is only one backslash, remove it directly.) To remove the escape character "", we can compare:

How to analyze the configuration file php.ini of PHP

Echoa

? >

Let's enter single quotation marks and double quotation marks in the text box in the case of magic_quotes_gpc=on and off respectively, and then submit them to see the difference.

SMTPstring specifies the domain name or IP address of the mail sending server so that we can send mail. This function of PHP is much simpler and more convenient than Microsoft's ASP. Some people want to ask, what if I don't have a mail server? It's simple, just fill in the local ISP mail server. In fact, the mail server is like the post office in our real life, it can send letters at any post office, and the mail is received at a fixed post office.

Mysql.default_hoststring

Mysql.default_userstring

Mysql.default_passwordstring

Readers who have used ODBC know that when setting up ODBC, you always need to set the location of the database and its default login user name and password. These parameters also mean the same thing, but are only used in MYSQL. For the sake of security, we also need to make some restrictions on the user's rights in MYSQL, do not be lazy to use "root" ah! If you set these parameters for convenience, we can connect to the database directly with the function mysql_connect (). Note that you don't need any parameters here!

You may be thinking, although this is very convenient, but also very dangerous! Don't worry, these parameters are not valid in PHP safe mode, so let's take a look at the safe mode settings.

Safemodeboolean, this is not the safe mode of WINDOWS98. When the PHP system is in safe mode, we can control the behavior of the PHP program to a certain extent. At this time, the default database host, user name, password and other settings of some databases such as MYSQL, INFOMIX, etc., are invalid, and illegal users cannot easily connect to the database. And in the safe mode safe_mode_allowed_env_varsstring this setting indicates what type of system environment variables can be changed by the program, if set to safe_mode_allowed_env_vars=PHP_, it means that only the system environment variables that start with PHP_ can be modified, for example, if you attempt to use putenv ("windir=UUU"); to modify the environment variables in the program, the system will prompt a safe mode protection error. In addition, the security mode has certain restrictions on the system command system (), such as only running in the specified directory, which can protect the system files to a certain extent.

The parameter log_errorsboolean specifies whether the error message should be recorded in the LOG document when the PHP program goes wrong. In NT systems, if we set up error_log=syslog at the same time, we can see the error messages that have occurred in PHP in the application log of the event viewer, which is helpful to test a large system.

Error_prepend_string= ""

Error_append_string= ""

These two setting parameters are more interesting, press the above setting, then we can see at a glance: whether our program is wrong! Because his function is to set error messages to a conspicuous red color.

As for many other options, some can be seen at a glance. If you are interested, try it yourself.

This is the answer to the question about how to dialyze PHP's profile php.ini. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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