| Conditions | 5 | 
| Paths | 5 | 
| Total Lines | 20 | 
| Code Lines | 10 | 
| Lines | 3 | 
| Ratio | 15 % | 
| Tests | 6 | 
| CRAP Score | 6.6 | 
| Changes | 0 | ||
| 1 | <?php | ||
| 42 | 2 | private function validate(array $config) | |
| 43 |     { | ||
| 44 | 2 |         if (!isset($config["driver"])) { | |
| 45 |             throw new InvalidArgumentException("Undefined driver"); | ||
| 46 | } | ||
| 47 | |||
| 48 | 2 | View Code Duplication |         if (!in_array($config["driver"], ["sqlsrv", "mysql", "pgsql", "sqlite"])) { | 
| 49 |             throw new InvalidArgumentException("Unrecognised driver"); | ||
| 50 | } | ||
| 51 | |||
| 52 | 2 |         if (!isset($config["connector"])) { | |
| 53 |             throw new InvalidArgumentException("Undefined connector"); | ||
| 54 | } | ||
| 55 | |||
| 56 | 2 |         if (!in_array($config["connector"], ["doorman", "blocking"])) { | |
| 57 |             throw new InvalidArgumentException("Unrecognised connector"); | ||
| 58 | } | ||
| 59 | |||
| 60 | 2 | return $config; | |
| 61 | } | ||
| 62 | } | ||
| 63 | 
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: