很多PHP程序员都知道,从PHP5.3开始加入了一个新的报错级别DEPRECATED,即将废弃/过期。下面我们来一个个版本梳理一下。
在php5.3被放弃的函数有:
call_user_method() //使用 call_user_func() 替代 call_user_method_array() //使用 call_user_func_array() 替代 define_syslog_variables() dl() ereg() //使用 preg_match() 替代 ereg_replace() //使用 preg_replace() 替代 eregi() //使用 preg_match() 配合 'i' 修正符替代 eregi_replace() //使用 preg_replace() 配合 'i' 修正符替代 set_magic_quotes_runtime() //以及它的别名函数 magic_quotes_runtime() session_register() //使用 $_SESSION 超全部变量替代 session_unregister() //使用 $_SESSION 超全部变量替代 session_is_registered() //使用 $_SESSION 超全部变量替代 set_socket_blocking() //使用 stream_set_blocking() 替代 split() //使用 preg_split() 替代 spliti() //使用 preg_split() 配合 'i' 修正符替代 sql_regcase() mysql_db_query() //使用 mysql_select_db() 和 mysql_query() 替代 mysql_escape_string() //使用 mysql_real_escape_string() 替代 mysql_close(); // 将不支持全部关闭, 需要改为:mysql_close($link);
废弃以字符串传递区域设置名称. 使用 LC_* 系列常量替代.
mktime() 的 is_dst 参数. 使用新的时区处理函数替代.
PHP 5.4:
mcrypt_generic_end() mysql_list_dbs()
PHP 5.5:
mcrypt_cbc() mcrypt_cfb() mcrypt_ecb() mcrypt_ofb()
其中,PHP 5.3是废弃函数的开始,很多常用的以前的正则ereg全部替换preg,但是魔术引号。居然也从PHP 5.3开始弃用,PHP 5.4就移除了。这个算是PHP 5.3的一个大变动吧。
PHP 5.4开始新增了很多特性,这个大家可以网上搜索下,新增很多特殊写法。可能按照新写法,老程序员就看不太懂啦~~~
至于PHP 5.5,居然把MYSQL这个扩展去掉了,建议使用MYSQLI或者PDO!!用了5.5很多程序都会报错,提示mysql_connect即将过期!!会看到如下错误:
Deprecated: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in E:testnew 6.php on line 6
PHP5相对于4的跨进最大的就是类的部分,而影响更多的就是废弃这些老习惯的东西吧。虽然版本一直在升级,但是终究市场上还是大量的5.1.6-5.2.17。5.3开始废弃很多特性,这就导致了很多程序也不敢直接上,5.5.直接秒杀了大量的开源产品!

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

The reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.


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