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28 lines
1.1 KiB
Clojure
28 lines
1.1 KiB
Clojure
[size=large][b]Frequently Asked Questions For Developers[/b][/size]
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(...) still needs to be written (...)
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[ul]
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[*][b]What does $a mean?[/b]
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$a is a class defined in boot.php and passed all around Red Matrix as a global reference variable. It defines everything necessary for the Red Matrix application: Server variables, URL arguments, page structures, layouts, content, installed plugins, output device info, theme info, identity of the observer and (potential) page owner ...
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We don't ever create more than one instance and always modify the elements of the single instance. The mechanics of this are somewhat tricky. If you have a function that is passed $a and needs to modify $a you need to declare it as a reference with '&' e.g.
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[code]function foo(&$a) { $a->something = 'x'; // whatever };
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*or* access it within your function as a global variable via get_app()
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function foo() {
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$a = get_app();
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$a->something = 'x';
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}
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function foo($a) { $a->something = 'x'; };
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will *not* change the global app state.
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function foo() {
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get_app()->something = 'x';
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}
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[/code]
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[/ul]
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