silverstripe-framework/tests/php/Core/ObjectTest/Extending.php

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<?php
namespace SilverStripe\Core\Tests\ObjectTest;
class Extending extends BaseObject
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{
private static $extensions = array(
Extending_Extension::class,
);
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public function getResults(&$first, &$second, &$third)
{
// Before extending should be invoked second
$this->beforeExtending(
'updateResult',
function (&$first, &$second, &$third) {
if ($first === 1 && $second === 2 && $third === 3) {
$first = 11;
$second = 12;
$third = 13;
return 'before';
}
return 'before-error';
}
);
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// After extending should be invoked fourth
$this->afterExtending(
'updateResult',
function (&$first, &$second, &$third) {
if ($first === 21 && $second === 22 && $third = 23) {
$first = 31;
$second = 32;
$third = 33;
return 'after';
}
return 'after-error';
}
);
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// Function body invoked first
$result = $this->extend('updateResult', $first, $second, $third);
return array($result);
}
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}