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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace EveryPolitician\EveryPolitician;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \GuzzleHttp;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use \League\Csv;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class LegislativePeriod  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public $id;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public $name;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public $slug;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $legislature;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $country;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected $legislativePeriodData;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function __construct($legislativePeriodData, $legislature, $country)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $properties = ['id', 'name', 'slug'];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        foreach ($properties as $k) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->$k = $legislativePeriodData[$k];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->legislature = $legislature;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->country = $country;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->legislativePeriodData = $legislativePeriodData;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __get($prop)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (in_array($prop, ['startDate', 'endDate', 'csvUrl'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $getter = 'get' . ucfirst($prop);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->$getter();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        trigger_error('Undefined property: '.__CLASS__.'::$'.$prop, E_USER_ERROR); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Return the start date of the legislative period  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * If this is unknown, it returns null.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getStartDate()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (array_key_exists('start_date', $this->legislativePeriodData)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->legislativePeriodData['start_date'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Return the end date of the legislative period  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * If this is unknown, it returns null.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getEndDate()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (array_key_exists('end_date', $this->legislativePeriodData)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->legislativePeriodData['end_date'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Return the URL to CSV of members during this legislative period  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function getCsvUrl()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return 'https://raw.githubusercontent.com/everypolitician'  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            .'/everypolitician-data/'.$this->legislature->sha  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            .'/'.$this->legislativePeriodData['csv'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Return parsed data from the CSV of members during the period  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * This returns a list of one dict per row of the CSV file, where  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * the keys are the column headers.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function csv()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client = new GuzzleHttp\Client();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $response = $client->get($this->csvUrl);  | 
            
                            
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                        $reader = Csv\Reader::createFromString($response->getBody());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return iterator_to_array($reader->fetchAssoc(), false);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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Since your code implements the magic getter
_get, this function will be called for any read access on an undefined variable. You can add the@propertyannotation to your class or interface to document the existence of this variable.If the property has read access only, you can use the @property-read annotation instead.
Of course, you may also just have mistyped another name, in which case you should fix the error.
See also the PhpDoc documentation for @property.