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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Elastica\Test\Processor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Elastica\Bulk;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Elastica\Document;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Elastica\Processor\RemoveProcessor;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Elastica\Test\BasePipeline as BasePipelineTest;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @internal  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class RemoveProcessorTest extends BasePipelineTest  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @group unit  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testRemove(): void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $processor = new RemoveProcessor('foo'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $expected = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'remove' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'field' => 'foo',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertEquals($expected, $processor->toArray());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @group unit  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testRemoveArray(): void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $processor = new RemoveProcessor(['foo', 'bar']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $expected = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            'remove' => [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'field' => ['foo', 'bar'],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->assertEquals($expected, $processor->toArray());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @group functional  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public function testRemoveField(): void  | 
            
            
                                                        
            
                                    
            
            
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                    { | 
            
            
                                                        
            
                                    
            
            
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                        $remove = new RemoveProcessor(['es_version', 'package']);  | 
            
            
                                                        
            
                                    
            
            
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                        $pipeline = $this->_createPipeline('my_custom_pipeline', 'pipeline for Remove'); | 
            
            
                                                        
            
                                    
            
            
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                        $pipeline->addProcessor($remove)->create();  | 
            
            
                                                        
            
                                    
            
            
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                        $index = $this->_createIndex();  | 
            
            
                                                        
            
                                    
            
            
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                        $bulk = new Bulk($index->getClient());  | 
            
            
                                                        
            
                                    
            
            
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                        $bulk->setIndex($index);  | 
            
            
                                                        
            
                                    
            
            
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                        $bulk->addDocuments([  | 
            
            
                                                        
            
                                    
            
            
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                            new Document(null, ['name' => 'nicolas', 'es_version' => 6, 'package' => 'Elastica']),  | 
            
            
                                                        
            
                                    
            
            
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                            new Document(null, ['name' => 'ruflin', 'es_version' => 5, 'package' => 'Elastica_old']),  | 
            
            
                                                        
            
                                    
            
            
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                        ]);  | 
            
            
                                                        
            
                                    
            
            
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                        $bulk->setRequestParam('pipeline', 'my_custom_pipeline'); | 
            
            
                                                        
            
                                    
            
            
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                        $bulk->send();  | 
            
            
                                                        
            
                                    
            
            
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                        $index->refresh();  | 
            
            
                                                        
            
                                    
            
            
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                        $result = $index->search('*'); | 
            
            
                                                        
            
                                    
            
            
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                        $this->assertCount(2, $result->getResults());  | 
            
                            
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                        foreach ($result->getResults() as $rx) { | 
            
            
                                                        
            
                                    
            
            
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                            $value = $rx->getData();  | 
            
            
                                                        
            
                                    
            
            
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                            $this->assertArrayNotHasKey('package', $value); | 
            
            
                                                        
            
                                    
            
            
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                            $this->assertArrayNotHasKey('es_version', $value); | 
            
            
                                                        
            
                                    
            
            
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                        }  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: