Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
1 | <?php |
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28 | class XoopsFile |
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29 | { |
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30 | /** |
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31 | * XoopsFile::getHandler() |
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32 | * |
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33 | * @param string $name name of file |
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34 | * @param string $path path file is in |
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35 | * @param boolean $create create file if needed |
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36 | * @param integer $mode mode on file created |
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37 | * |
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38 | * @return XoopsFileHandler|XoopsFolderHandler|bool |
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39 | */ |
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40 | 45 | public static function getHandler($name = 'file', $path = false, $create = false, $mode = null) |
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56 | } |
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57 |
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.