本文实例讲述了PHP中ini_set与ini_get的用法。分享给大家供大家参考。具体如下:
PHP ini_set函数。
PHP ini_set函数是设置选项中的值,在执行函数后生效,脚本结束的时候,这个设置也失效。不是所有的选项都能被该函数设置的。具体那些值能够设置,可以查看手册中的列表。
就是能够设置php.ini中的选项值比如,display_error选项关闭了,但是你要显示程序中的错误信息,方便你调试程序,那么就可以使用PHP ini_set函数:
代码如下:
ini_set("display_errors", "On");
那么在你这个页面的程序都会显示错误信息了,而且你还可以使用error_reporting来设置显示的错误信息级别。
如果你需要增加脚本执行时间,那么可以设置:
代码如下:
ini_set("max_execution_time", "180″);
那么脚本执行时间就由默认的30秒变为180秒,当然,你也可以使用set_time_limit()来设置。
其实你把PHP ini_set函数和ini_get结合使的话,非常好。比如你想在配置文件里添加自己的包含文件路径,但是你有没有权限更改php.ini,那么你可以结合两个函数:
代码如下:
ini_set('include_path',ini_get('include_path').':/your_include_dir:');
PHP中的函数作用功能各不相同,灵活的使用这些函数,才能将这门语言发挥出极大的作用。
PHP配置函数ini_get()相信很多人都使过,就是获取配置文件中某一个选项的值,如果是true值就返回1,如果是false值就返回0,字符串就返回字符串。
比如手册中的例子:
代码如下:
echo 'display_errors = ' . ini_get('display_errors') . " "; //显示错误是否打开
echo 'register_globals = ' . ini_get('register_globals') . " ";//全局变量是否打开
echo 'post_max_size = ' . ini_get('post_max_size') . " ";//最多能提交的文件大小
echo 'post_max_size+1 = ' . (ini_get('post_max_size')+1) . " ";
?>
输出:
display_errors = 1
register_globals = 0
post_max_size = 8M
post_max_size+1 = 9
PHP配置函数ini_get()主要是为了获取配置文件,可以方便你很多操作。比如你想操作字符串过滤,但是又不清楚magic_quotes_gpc有没有打开,所以你就可以这样写一个函数:
代码如下:
function stringFilter($str)
{
if (ini_get('magic_quotes_gpc)')
{
return $str;
}else{
return addslashes($str);
}
}
当然,如果你无法知道你的全局变量是否打开,也可以定制这样的函数:
代码如下:
function getGetVar($var)
{
if (ini_set('register_gobals'))
{
return $var;
} else {
return $_GET['var'];
}
}
当然,你可以用PHP配置函数ini_get()做很多用途,自己慢慢体会。
希望本文所述对大家的PHP程序设计有所帮助。

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.


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