PHP 6 compared to PHP 5 for those changes and improvements _php Tutorial

PHP 6 has been out for years, although PHP 5 is commonly used, but after all, PHP 6 is the future trend. So what's the change in PHP 6 for PHP 5, and what improvements are there?

1. Support for Unicode

Unicode support is inevitable, although Unicode occupies more space, but the convenience of Unicode, far more than the disadvantage of occupying space, especially in the internationalization of today, hardware equipment more and more powerful, speed also greatly improved, so a little shortcomings can be ignored.

Another point, PHP can also be set in the. ini file whether to turn on support Unicode, the decision on your own, this is a good idea, turn off Unicode support, PHP performance does not have a significant increase, the main impact is the need to reference a string of functions.

2.Register Globals will be removed

This is an important decision, saying that many new PHP developers will feel that register globals full of convenience, but ignored the register globals will bring the security of the program, most of the host on this feature is closed, Impression from the beginning of the php4.3.x version, this default setting value is closed state, PHP6 formally removed register globals also means that if the program is the product of the PHP3 era, will be completely unusable, in addition to rewriting one way, there is no other method. Believe that the current PHP world, still using the PHP3 era generated by the program should be few.

3.Magic Quotes will disappear

The Magic quotes is primarily auto-escaping characters that need to be escaped, and this feature removal is also consistent with the voice of most PHP developers.

4.Safe Mode Cancel

Frankly speaking, this mode does not know where is not good, cancel it, it is not used anyway.

5. ' var ' alias is ' public '

The Var declaration in the class becomes the alias of public, which is believed to be a decision for compatibility with PHP5, and PHP6 can now be called the OO language.

6. Returning by reference will make an error

The compiler will now return an error by referencing it. For example, $ A =& new B (), function &c (), OO language default is reference, so no need to use &.

7.zend.ze1 compatbility mode will be removed/ZEND.ZE1 compatibility modes will be removed

PHP5 is for compatibility with the old PHP4, so in. ini you can choose whether to turn on compatibility mode, because PHP5 uses the second generation of the parsing engine, but the compatibility mode is not fully capable of parsing PHP4 syntax, so the artifacts of the past, removed.

8.Freetype 1 and GD 1 support will not be visible

These two are long libs, so no longer support, GD1 has already been replaced by the GD2 now.

9.DL () is moved to SAPI

DL () is mainly for designers to load extension Libs, which is now moved to SAPI

10.Register Long Array Removal

PHP5 from the default is off, and then PHP6 officially removed.

11. Changes to some extension

For example, XMLReader and XMLWriter will no longer appear in extension way, they will be moved into the core of PHP, and the default is open, Ereg extension will be put into pecl, which means that it will be removed from the PHP core, This is also to give way to the new regular expression extension, in addition, Fileinfo extension will also be imported into the core of PHP.

12.APC will be imported into the core

This is a feature that improves PHP performance and is now placed in the PHP core, with the option to enable APC

13. Say goodbye to ASP-style start tags

The original is to please the ASP developers to the use of PHP, now no longer need this practice, and finally, do not expect PHP6 performance can be fully exceeded PHP5, it is possible that PHP6 execution efficiency will be slower than PHP5, but it can be expected that PHP Development Team will strive to improve PHP 6, beyond PHP 5.

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