What are the functions deprecated in php7?

php7 deprecated functions include mysql_ series functions, ereg_ series functions, split() function, create_function() function, mcrypt_ series functions and iconv() function, etc. Detailed introduction: 1. mysql_ series of functions. In PHP7, the mysql_ series of functions are deprecated. These functions are old APIs used to interact with the MySQL database. In the PHP5.5 version, more modern and secure functions have been introduced. functions and so on.

The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.

PHP 7 is an important version of the PHP programming language, introducing many new features and improvements. At the same time, in order to improve the quality and security of the code, PHP 7 also discarded some old functions. The following are some examples of functions that are deprecated in PHP 7:

1. mysql_ series of functions: In PHP 7, the mysql_ series of functions (such as mysql_connect, mysql_query, etc.) are deprecated. These functions are the old API for interacting with MySQL databases, while the more modern and secure mysqli_ and PDO extensions have been introduced in PHP 5.5 version. It is recommended to use mysqli_ or PDO extension to replace the mysql_ series of functions.

2. ereg_ series functions: The ereg_ series functions (such as ereg_match, ereg_replace, etc.) are abandoned. These functions are used for matching and replacing regular expressions. In PHP 7, it is recommended to use the more efficient and powerful preg_ series functions (such as preg_match, preg_replace, etc.) to replace the ereg_ series functions.

3. split() function: The split() function is abandoned. This function is used to split strings into arrays. In PHP 7, it is recommended to use the more powerful and flexible preg_split() function instead of the split() function.

4. create_function() function: The create_function() function is deprecated, which is used to dynamically create anonymous functions at runtime. In PHP 7, it is recommended to use a more concise and readable anonymous function expression (that is, an anonymous function defined using the function keyword) instead of the create_function() function.

5. mcrypt_ series functions: mcrypt_ series functions (such as mcrypt_encrypt, mcrypt_decrypt, etc.) are deprecated. These functions are the old API for encrypting and decrypting data, while in PHP 7 the more modern and secure openssl_ extension has been introduced. It is recommended to use openssl_ extension instead of mcrypt_ series functions.

6. iconv() function: iconv() function is abandoned. This function is used for conversion between character encodings. In PHP 7, it is recommended to use the more efficient and powerful mb_convert_encoding() function instead of the iconv() function.

These are just some examples of functions that are deprecated in PHP 7. There are other functions that have also been deprecated or changed. Before using PHP 7, developers are recommended to consult the official PHP documentation to learn about all deprecated functions and new alternatives to ensure code compatibility and security. At the same time, the code is updated and optimized in a timely manner to adapt to the new version of PHP and improve the performance and stability of the application.

The above is the detailed content of What are the functions deprecated in php7?. For more information, please follow other related articles on the PHP Chinese website!