1 | <?php |
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7 | use DateTime as DateTimeStandard; |
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8 | |||
9 | /** |
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10 | * A collection of filters for filtering strings into \DateTime objects. |
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11 | */ |
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12 | class DateTime |
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13 | { |
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14 | /** |
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15 | * Filters the given value into a \DateTime object. |
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16 | * |
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17 | * @param mixed $value The value to be filtered. |
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18 | * @param boolean $allowNull True to allow nulls through, and false (default) if nulls should not be allowed. |
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19 | * @param DateTimeZone $timezone A \DateTimeZone object representing the timezone of $value. |
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20 | * If $timezone is omitted, the current timezone will be used. |
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21 | * |
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22 | * @return DateTimeStandard|null |
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23 | * |
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24 | * @throws Exception if the value did not pass validation. |
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25 | */ |
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26 | public static function filter($value, bool $allowNull = false, DateTimeZone $timezone = null) |
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27 | { |
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28 | if ($value === null && $allowNull) { |
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29 | return null; |
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30 | } |
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31 | |||
32 | if ($value instanceof \DateTime) { |
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33 | return $value; |
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34 | } |
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35 | |||
36 | if (is_int($value) || ctype_digit($value)) { |
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37 | $value = "@{$value}"; |
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38 | } |
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39 | |||
40 | if (!is_string($value) || trim($value) == '') { |
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41 | throw new Exception('$value is not a non-empty string'); |
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42 | } |
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43 | |||
44 | return new \DateTime($value, $timezone); |
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45 | } |
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46 | |||
47 | /** |
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48 | * Filters the give \DateTime object to a formatted string. |
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49 | * |
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50 | * @param DateTimeInterface $dateTime The date to be formatted. |
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51 | * @param string $format The format of the outputted date string. |
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52 | * |
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53 | * @return string |
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54 | * |
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55 | * @throws \InvalidArgumentException Thrown if $format is not a string |
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56 | */ |
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57 | public static function format(DateTimeInterface $dateTime, string $format = 'c') : string |
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65 | } |
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66 |
Let’s assume that you have a directory layout like this:
and let’s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: