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                <?php  | 
            
                            
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                use Caxy\HtmlDiff\HtmlDiff;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                ini_set('display_errors', 1); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                error_reporting(E_ALL);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require __DIR__.'/../vendor/autoload.php';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                $debugOutput = array();  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                function addDebugOutput($value, $key = 'general')  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    global $debugOutput;  | 
            
                            
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                    if (!is_string($value)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $value = var_export($value, true);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    if (!array_key_exists($key, $debugOutput)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $debugOutput[$key] = array();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    $debugOutput[$key][] = $value;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                $input = file_get_contents('php://input'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                if ($input) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    header('Content-Type: application/json'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $data = json_decode($input, true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $oldText = $data['oldText'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $newText = $data['newText'];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $useTableDiffing = isset($data['tableDiffing']) ? $data['tableDiffing'] : true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $diff = new HtmlDiff($oldText, $newText, 'UTF-8', array());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    if (array_key_exists('matchThreshold', $data)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $diff->setMatchThreshold($data['matchThreshold']);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $diff->setUseTableDiffing($useTableDiffing);  | 
            
                            
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                    $diffOutput = $diff->build();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $diffOutput = iconv('UTF-8', 'UTF-8//IGNORE', $diffOutput); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    $jsonOutput = json_encode(array('diff' => $diffOutput, 'debug' => $debugOutput)); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    if (false === $jsonOutput) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        throw new \Exception('Failed to encode JSON: '.json_last_error_msg()); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    echo $jsonOutput;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    header('Content-Type: text/html'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    echo file_get_contents('demo.html'); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.