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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class JsonField combines form inputs into a key-value pair  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class JsonField extends CompositeField  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct($name, $children = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->setName($name);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($children instanceof FieldList) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($children as $child) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $child->setName($this->getName() . "[" . $child->getName() . "]");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } elseif (is_array($children)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($children as $child) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $child->setName($this->getName() . "[" . $child->getName() . "]");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $children = is_array(func_get_args()) ? func_get_args() : array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (!empty($children)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                array_shift($children);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($children as $child) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $child->setName($this->getName() . "[" . $child->getName() . "]");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        parent::__construct($children);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function hasData()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return true;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    //have to has it to overwritten CompositeField behavior  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function collateDataFields(&$list, $saveableOnly = false)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    function array_filter_empty_recursive($haystack)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($haystack as $key => $value) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (is_array($value)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $haystack[$key] = $this->array_filter_empty_recursive($haystack[$key]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (empty($haystack[$key])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                unset($haystack[$key]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $haystack;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function dataValue()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_array($this->value)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $this->value = $this->array_filter_empty_recursive($this->value);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (!empty($this->value)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return Convert::array2json($this->value);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return parent::dataValue();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Load a value into this CheckboxSetField  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setValue($value)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->value = $value;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_string($value) && !empty($value)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $value = Convert::json2array($value);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        } // @codeCoverageIgnoreStart  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        elseif (!is_array($value)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $value = array($value);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // @codeCoverageIgnoreEnd  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $patten = "/^" . $this->getName() . "\[(.*)\]$/";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($this->children as $c) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $title = $c->getName();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            preg_match($patten, $title, $matches);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            if (!empty($matches[1]) && isset($value[$matches[1]])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $c->setValue($value[$matches[1]]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.