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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Yajra\CMS\Http\Controllers;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Yajra\CMS\Entities\Configuration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use App\Http\Requests;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Illuminate\Http\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class SiteConfigurationController  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package Yajra\CMS\Controllers  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class SiteConfigurationController extends Controller  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Site configuration setup page.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Yajra\CMS\Entities\Configuration $configuration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function index(Configuration $configuration)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return view('administrator.configuration.index', compact('configuration')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Store submitted configurations.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param \Illuminate\Http\Request $request  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function store(Request $request)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $cleanArray = $request->all();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $array      = ['config' => $cleanArray['config']] + $cleanArray; // set config array value to first.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->storeConfiguration($array);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Run submitted configurations.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function storeConfiguration($array)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($array as $key => $value) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if ($key == 'config') { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $setKey = $value;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $cleanKey = $setKey . '.' . str_replace('AAA', '.', $key); // remove js replacement string. | 
            
                            
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                                $this->removeByKey($cleanKey);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                Configuration::create(['key' => $cleanKey, 'value' => $value]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Remove configuration by key.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $key  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Configuration  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function removeByKey($key)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return Configuration::where('key', $key)->delete(); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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: