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https://www.php.net/manual/en/language.namespaces.php
Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions ... <?php namespace app \ a { class one { public static function _1 (){ echo 'a one _1<br>'; } }} namespace app \ b class one ...
https://www.php.net/manual/en/language.namespaces.rationale.php
(PHP 5 >= 5.3.0, PHP 7) What are namespaces? In the broadest definition namespaces are a way of encapsulating items. This can be seen as an abstract concept in many places. For example, in any operating system directories serve to group related files, and act as a namespace for the files within them.
https://www.php.net/manual/en/language.namespaces.basics.php
(PHP 5 >= 5.3.0, PHP 7) Before discussing the use of namespaces, it is important to understand how PHP knows which namespaced element your code is requesting. A simple analogy can be made between PHP namespaces and a filesystem. There are three ways to access a file in a file system: Relative file name like foo.txt.
https://en.wikipedia.org/wiki/PHP
PHP version 5.5 made the 64-bit x86-64 builds available for Microsoft Windows. Official security support for PHP 5.6 ended on 31 December 2018, but Debian 8.0 Jessie will extend support until June 2020. PHP 6 and Unicode. PHP received mixed reviews due to lacking native Unicode support at the core language level.Designed by: Rasmus Lerdorf
https://stackoverflow.com/questions/6473126/namespaces-in-php-5-2
Namespaces are only available as of 5.3. At least in the case of classes, you can use the class_exists function to check if a class has already been defined with a like name within the global namespace. Coupled with the __autoload() function, you can create one universal alias and have the system check for both classes named by the original name as well as the name …
https://wiki.php.net/rfc/namespace_scoped_declares
PHP 7 introduced the strict_types declare directive, which controls how scalar type declarations behave in a certain file. A common complaint is that this directive has to be specified in every single file. This RFC proposes the addition of namespace-scoped declares, which allows specifying a default declare directive for an entire namespace. While this improves the …
https://www.php.net/manual/en/example.xmlwriter-namespace.php
Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Credit Card Processing Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and ...
https://www.drupal.org/docs/7/system-requirements/php-requirements
(1) The minimum recommended PHP version for Drupal 7 was PHP 7.1.x until its official end-of-life at 1 Dec, 2019. (2) Some vendors like RedHat/CentOS and Ubuntu LTS offer extended support for these versions of PHP, check with your vendor. (3) The latest Drupal 7 version is recommended to get full PHP 7 support.
http://bugs.php.net/bug.php?id=47872
Another option, which I can't quite assess, would be to always (silently) use the root namespace. For some reason I don't believe this is a good idea in PHP. Maybe because, as seen in my example, is the ability to expand the root/global namespace with other (own) classes.
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