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 10 and the first side effect is on line 5.
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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namespace Webuni\ComposerYamlPlugin\Tests;
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require __DIR__.'/../vendor/autoload.php';
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use PHPUnit\Framework\TestCase;
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if (class_exists(TestCase::class)) {
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class CompatibleTestsCase extends TestCase {}
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} else {
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class CompatibleTestsCase extends \PHPUnit_Framework_TestCase {}
The type Webuni\ComposerYamlPlugi...sts\CompatibleTestsCase has been defined more than once; this definition is ignored, only the first definition in this file (L10-10) is considered.
This check looks for classes that have been defined more than once in the same file.
If you can, we would recommend to use standard object-oriented programming
techniques. For example, to avoid multiple types, it might make sense to create a
common interface, and then multiple, different implementations for that interface.
This also has the side-effect of providing you with better IDE auto-completion,
static analysis and also better OPCode caching from PHP.
PSR1 recommends that each class should be in its own file to aid autoloaders.
Having each class in a dedicated file usually plays nice with PSR autoloaders
and is therefore a well established practice. If you use other autoloaders, you
might not want to follow this rule.
webuni /
composer-yaml-plugin
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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.