gravityview /
GravityView
| 1 | <?php |
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| 18 | abstract class Source { |
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| 19 | |||
| 20 | /** |
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| 21 | * @var string BACKEND_INTERNAL The backend identifier for special GravityView data sources |
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| 22 | * like custom content and the like. Not really a form, but a source nevertheless. |
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| 23 | */ |
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| 24 | const BACKEND_INTERNAL = 'internal'; |
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| 25 | |||
| 26 | /** |
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| 27 | * @var string BACKEND_GRAVITYFORMS The backend identifier for special GravityView data sources |
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| 28 | * like custom content and the like. Not really a form, but a source nevertheless. |
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| 29 | */ |
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| 30 | const BACKEND_GRAVITYFORMS = 'gravityforms'; |
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| 31 | |||
| 32 | /** |
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| 33 | * @var string The identifier of the backend used for this source. |
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| 34 | * |
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| 35 | * @see Constant backend identifiers above and \GV\Source subclasses. |
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| 36 | * |
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| 37 | * @api |
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| 38 | * @since future |
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| 39 | */ |
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| 40 | public static $backend = null; |
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| 41 | } |
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| 42 |
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.