1 | <?php |
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9 | class MicroDate |
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10 | { |
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11 | /** @var int */ |
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12 | public $sec; |
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13 | /** @var int */ |
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14 | public $uSec; |
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15 | |||
16 | /** |
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17 | * @param int $sec |
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18 | * @param int $uSec |
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19 | */ |
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20 | 5 | public function __construct(int $sec, int $uSec) |
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25 | |||
26 | /** |
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27 | * @param \DateTime $date |
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28 | * |
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29 | * @return MicroDate |
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30 | */ |
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31 | 1 | public static function createFromDateTime(DateTime $date): MicroDate |
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35 | |||
36 | /** |
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37 | * @return MicroDate |
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38 | */ |
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39 | 3 | public static function now(): MicroDate |
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45 | |||
46 | /** |
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47 | * @param DateTimeZone|null $timeZone |
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48 | * |
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49 | * @return DateTime |
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50 | */ |
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51 | 2 | public function toDateTime(DateTimeZone $timeZone = null): DateTime |
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60 | } |
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61 |
This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$x
would be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.