Program production PHP website installation program production principles, steps, precautions and sample codes

1. The principle of making a PHP installation program
In fact, the installation principle of a PHP program is nothing more than importing the database structure and content into the corresponding database, and reconfiguring the parameters and files connected to the database from this process, in order to ensure that it is not used maliciously by others. The installation file needs to be modified after the installation is completed.
2. Steps to make a PHP installer
step1 Check the permissions of the directory or file
step2 Modify or add the configuration file
step3 Check the correctness of the configuration file
step4 Import the database
step5 Lock or delete the installation file
3. Make the installation files The PHP function
checks whether the file is writable and returns a Boolean value: is_writable("data/config.php");
checks whether the file is readable and returns a Boolean value: is_readable("data/config.php");
fopen( ) File operation function, open a file or create a new one
fwrite() File operation function, write content to the file
rename() File operation function, rename the file
4. Notes
(1). Correct files and related folders Permissions are checked, such as cache, generated files, and configuration files
(2). The installation file is as independent as possible, can be deleted, and can be renamed.
(3). When importing the database, you need to check:
a. Check whether you have permission to create the database
b. Whether the database with the same name exists
c. Consider whether the size of the database import is processed in segments
(4). Check the configuration Environment, support of various modules, such as: gd2, pdo, rewirte, etc.
5. The sample code is as follows

Copy the code The code is as follows:

$files="data/config. php";
if(!is_writable($files)){
echo "Not writable! ! ";
}else{
echo " Writable ";
}
if(isset($_POST[install])){
$config_str = "$config_str .= "n";
$config_str .= ' $mysql_host = "' . $_POST[db_host] . '";';
$config_str .= "n";
$config_str .= '$mysql_user = "' . $_POST[db_user] . '";';
$config_str .= "n";
$config_str .= '$mysql_pass = "' . $_POST[db_pass] . '";';
$config_str .= "n";
$config_str .= '$mysql_dbname = " ' . $_POST[db_dbname] . '";';
$config_str .= "n";
$config_str .= '$mysql_tag = "' . $_POST[db_tag] . '";';
$config_str .= "n";
$config_str .= '?>';
$ff = fopen($files, "w+");
fwrite($ff, $config_str);
//======== =============
include_once ("data/config.php"); //Embed configuration file
if (!@$link = mysql_connect($mysql_host, $mysql_user, $mysql_pass)) { //Check the database connection
echo "Database connection failed! Please return to the previous page to check the connection parametersReturn for modification";
} else {
mysql_query("CREATE DATABASE `$mysql_dbname`");
mysql_select_db($mysql_dbname);
$sql_query[] = "CREATE TABLE `" . $mysql_tag . "admin_log1` (
`id` int(8) unsigned NOT NULL auto_increment,
`username` varchar(40) NOT NULL COMMENT 'Operation user name',
`types` varchar(60) NOT NULL,
PRIMARY KEY (`id`)
) ;";
$sql_query[] = "CREATE TABLE `" . $ mysql_tag . "admin_log2` (
`id` int(8) unsigned NOT NULL auto_increment,
`username` varchar(40) NOT NULL COMMENT 'Operation user name',
`types` varchar(60) NOT NULL,
PRIMARY KEY (`id`)
) ;";
$sql_query[] = "CREATE TABLE `" . $mysql_tag . "admin_log3` (
`id` int(8) unsigned NOT NULL auto_increment,
`username` varchar(40) NOT NULL COMMENT 'Operation user name',
`types` varchar(60) NOT NULL,
PRIMARY KEY (`id`)
) ;";
foreach($sql_query as $val){
mysql_query($val);
}
echo "<script>alert('Installation successful!');location.href='index.php'</script>";
rename("install.php","install.lock");
}
}
?>

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Fill in the host:

Username:

Password:

Database name:

Data prefix:

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The above introduces the principles, steps, precautions and sample codes of program production and PHP website installation program production, including program production. I hope it will be helpful to friends who are interested in PHP tutorials.