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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| 36 | class RoboFile extends \Robo\Tasks  | 
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| 37 | { | 
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| 38 | |||
| 39 | /**  | 
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| 40 | * The build properties.  | 
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| 41 | *  | 
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| 42 | * @var array  | 
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| 43 | */  | 
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| 44 | protected $properties = array(  | 
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| 45 | 'base.dir' => __DIR__,  | 
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| 46 | 'src.dir' => __DIR__ . '/src',  | 
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| 47 | 'dist.dir' => __DIR__ . '/dist',  | 
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| 48 | 'vendor.dir' => __DIR__ . '/vendor',  | 
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| 49 | 'target.dir' => __DIR__ . '/target'  | 
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| 50 | );  | 
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| 51 | |||
| 52 | /**  | 
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| 53 | * Run's the composer install command.  | 
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| 54 | *  | 
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| 55 | * @return \Robo\Result The result  | 
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| 56 | */  | 
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| 57 | public function composerInstall()  | 
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| 65 | |||
| 66 | /**  | 
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| 67 | * Run's the composer update command.  | 
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| 68 | *  | 
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| 69 | * @return \Robo\Result The result  | 
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| 70 | */  | 
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| 71 | public function composerUpdate()  | 
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| 79 | |||
| 80 | /**  | 
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| 81 | * Clean up the environment for a new build.  | 
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| 82 | *  | 
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| 83 | * @return \Robo\Result The result  | 
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| 84 | */  | 
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| 85 | public function clean()  | 
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| 89 | |||
| 90 | /**  | 
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| 91 | * Prepare's the environment for a new build.  | 
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| 92 | *  | 
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| 93 | * @return \Robo\Result The result  | 
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| 94 | */  | 
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| 95 | public function prepare()  | 
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| 103 | |||
| 104 | /**  | 
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| 105 | * Run's the PHPMD.  | 
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| 106 | *  | 
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| 107 | * @return \Robo\Result The result  | 
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| 108 | */  | 
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| 109 | View Code Duplication | public function runMd()  | 
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| 122 | |||
| 123 | /**  | 
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| 124 | * Run's the PHPCPD.  | 
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| 125 | *  | 
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| 126 | * @return \Robo\Result The result  | 
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| 127 | */  | 
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| 128 | public function runCpd()  | 
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| 148 | |||
| 149 | /**  | 
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| 150 | * Run's the PHPCodeSniffer.  | 
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| 151 | *  | 
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| 152 | * @return \Robo\Result The result  | 
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| 153 | */  | 
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| 154 | View Code Duplication | public function runCs()  | 
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| 167 | |||
| 168 | /**  | 
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| 169 | * Run's the PHPUnit tests.  | 
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| 170 | *  | 
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| 171 | * @return \Robo\Result The result  | 
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| 172 | */  | 
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| 173 | public function runTests()  | 
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| 174 |     { | 
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| 175 | |||
| 176 | // run PHPUnit  | 
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| 177 |         return $this->taskPHPUnit(sprintf('%s/bin/phpunit', $this->properties['vendor.dir'])) | 
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| 178 |              ->configFile('phpunit.xml') | 
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| 179 | ->run();  | 
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| 180 | }  | 
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| 181 | |||
| 182 | /**  | 
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| 183 | * The complete build process.  | 
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| 184 | *  | 
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| 185 | * @return void  | 
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| 186 | */  | 
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| 187 | public function build()  | 
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| 201 | }  | 
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| 202 | 
It seems like the method you are trying to call exists only in some of the possible types.
Let’s take a look at an example:
Available Fixes
Add an additional type-check:
Only allow a single type to be passed if the variable comes from a parameter: