The respective features of php5 and PHP7

PHP5(Recommended learning: PHP video tutorial)

Although the development of PHP4 is so rapid, compared with Compared with other popular development languages, it still lacks some key functional features. For example, the object-oriented functions in PHP4 are not perfect and cannot capture and handle exceptions. Therefore, we are still stretched in dealing with some special issues.

In July 2004, the release of the official version of PHP5 marked the arrival of a new PHP era. At its core is the second-generation Zend engine, which introduces support for the new PECL module. The biggest feature of PHP5 is that it introduces all object-oriented mechanisms and retains downward compatibility. Programmers no longer have to write classes that lack functionality, and can implement class protection in a variety of ways. In addition, there are no longer problems with object integration. Using PHP5 introduces type hints and exception handling mechanisms, which can handle and avoid errors more effectively.

While being continuously updated, PHP5 still retains the ability to run old PHP4 programs on the PHP5 platform

without major problems. With the development of the MySQL database, PHP5 is also bound to the new MySQLi extension module, which provides some more effective methods and practical tools for handling database operations. Most of these methods are implemented in an object-oriented manner, and they also greatly improve the execution speed of database-based Web projects.

In addition, PHP5 has also improved the function of creating dynamic pictures, which can support multiple image formats (such as PNG, GIF, TTIF, JPGE, etc.). PHP5 has built-in support for the GD2 library, so it is no longer difficult to install the GD2 library (mainly in UNIX systems), which makes processing images very simple and efficient.

Most web program developers still use XML as a completely simple database. PHP5 also uses a series of simple, easy-to-use, and powerful methods to process XML documents.

Today, millions of websites, including Yahoo and Amazon, as well as numerous developers and programming enthusiasts are using PHP. From the initial PHP/FI to PHP5, PHP has developed extremely rapidly, and its future development prospects must also be eye-catching.

PHP 7.0.0 Alpha uses the new version of ZendEngine engine, which brings many new features. The following is an incomplete list:

Performance improvement: PHP7 than PHP5. 6 Performance has been improved by two times. Improved performance: PHP 7 is up to twice as fast as PHP 5.6

Full and consistent 64-bit support. Consistent 64-bit support

Many fatal errors in the past are now changed to throwing exceptions. Many fatal errors are now Exceptions

Removed some old SAPI (Server Side Application Programming Port) and extensions that are no longer supported. Removal of old and unsupported SAPIs and extensions

New null join operator has been added. The null coalescing operator (??)

Newly added combined comparison operator. Combined comparison Operator ()

Newly added function return type declaration. Return Type Declarations

Newly added scalar type declarations. Scalar Type Declarations

Newly added anonymous classes. Anonymous Classes

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