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Changes and improvements in PHP 6 compared with PHP 5_PHP Tutorial
- WBOYOriginal
- 2016-07-13 10:34:02661browse
PHP 6 has been out for many years. Although PHP 5 is still commonly used now, after all, PHP 6 is still the future trend. So what changes have PHP 6 compared to PHP 5, and what improvements have been made?
1. Support Unicode
Supporting Unicode is inevitable. Although Unicode takes up more space, the convenience brought by Unicode far outweighs the disadvantages of taking up space. Especially in today's internationalization, hardware devices are becoming more and more powerful, and network speeds are also increasing. With such a substantial improvement, such a small shortcoming can be ignored.
Another point, PHP can also set whether to enable Unicode support in the .ini file. The decision is up to you. This is a good idea. Turning off Unicode support will not significantly improve PHP's performance. The main impact of the upgrade is on functions that require quoted strings.
2.Register Globals will be removed
This is an important decision. Many new PHP developers will find Register Globals very convenient, but they ignore that Register Globals will bring program security risks. This feature is available on most hosts. It is closed. I have the impression that starting from PHP 4.3. There is no other way than to rewrite it. I believe that in the current PHP world, there should be very few programs produced in the PHP3 era.
3.Magic Quotes will disappear
Magic Quotes mainly automatically escapes characters that need to be escaped. The removal of this function is also in line with the aspirations of most PHP developers.
4.Safe Mode Cancel
Honestly, I don’t know what’s wrong with this mode. Just cancel it. It won’t be used anyway.
5. ‘var’ is aliased as ‘public’
The var declaration in the class becomes a public alias. I believe this is a decision made to be compatible with PHP5. PHP6 can now also be called an OO language.
6. Returning by reference will cause an error
Returning by reference will now cause an error to the compiler. For example, $a =& new b(), function &c(), OO language uses references by default, so there is no need to use &.
7.zend.ze1 compatbility mode will be removed/Zend.ze1 compatibility mode will be removed
PHP5 is compatible with the old PHP4, so you can choose whether to turn on the compatibility mode in the .ini. The reason is that PHP5 uses the second-generation parsing engine, but the compatibility mode is not 100% able to parse PHP4 syntax, so the old A product of the times, removed.
8.Freetype 1 and GD 1 support will disappear
These two are Libs for a long time, so they are no longer supported. GD1 has long been replaced by the current GD2.
9.dl() has been moved to SAPI
dl() mainly allows designers to load extension Libs, and is now moved to SAPI
10.Register Long Array Remove
It is turned off by default starting from PHP5, and will be officially removed in PHP6.
11. Some Extension changes
For example, XMLReader and XMLWriter will no longer appear as Extensions. They will be moved into the core of PHP and are enabled by default. The ereg extension will be placed in PECL, which means it will be moved out of the core of PHP. This is also to make way for the new regular expression extension. In addition, the Fileinfo extension will also be imported into the core of PHP.
12.APC will be imported into the core
This is a feature to improve PHP performance, it will now be put into PHP core with the option to enable APC
13. Say goodbye to ASP-style start tags
Originally, it was to please ASP developers to switch to PHP. This approach is no longer needed. Finally, don’t expect that the performance of PHP6 can comprehensively exceed that of PHP5. It is possible that the execution efficiency of PHP6 will be even higher than that of PHP5. Slowly, but it can be expected that the PHP development team will work hard to improve PHP 6 and surpass PHP 5.