For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 36 and the first side effect is on line 38.
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.
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/**
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* This file is the entry point for all API queries.
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*
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* It begins by checking whether the API is enabled on this wiki; if not,
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* it informs the user that s/he should set $wgEnableAPI to true and exits.
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* Otherwise, it constructs a new ApiMain using the parameter passed to it
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* as an argument in the URL ('?action=') and with write-enabled set to the
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* value of $wgEnableWriteAPI as specified in LocalSettings.php.
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* It then invokes "execute()" on the ApiMain object instance, which
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* produces output in the format specified in the URL.
wikimedia /
mediawiki
Yuri Astrakhan
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.