Return true if the field is set.

@param string $name

@return bool
438934
public function isDirty($name)
    {
        /** @type Field_Base $field */
        $field = $this->getElement($name);

        return $this->dirty[$name] ||
            (!$this->loaded() && $field->has_default_value);
    }
1352956
public function removeField($name)
    {
        foreach ($this->fields as $tab => $fields) {
            foreach ($fields as $fieldName => $field) {
                if ($fieldName == $name) {
                    unset($this->fields[$tab][$fieldName]);

                    /*
                     * Remove empty tabs from collection
                     */
                    if (!count($this->fields[$tab])) {
                        unset($this->fields[$tab]);
                    }

                    return true;
                }
            }
        }

        return false;
    }
863307
public function __isset($name)
	{
		if (method_exists($this, 'get_' . $name) || isset($this->$name))
		{
			return true;
		}
		else
		{
			return false;
		}
	}
690992
public function __isset($name)
    {
        $variables = $this->getVariables();
        $method = 'get' . ucfirst($name);
        $flag = method_exists($variables, $method);


        return $flag;
    }
715330
public function __isset($name)
    {
        if ($method = $this->getPresenterMethodFromVariable($name)) {
            $result = $this->$method();

            return isset($result);
        }

        if (is_array($this->object)) {
            return isset($this->object[$name]);
        }

        return isset($this->object->$name);
    }
380213
public static function getFieldset($name) {
        if (!isset(self::$fieldsets[$name])) {
            try {
                self::$fieldsets[$name] = Fieldset::i($name);
            } catch (Exception $e) {
                return false;
            }
        }

        return self::$fieldsets[$name];
    }
90127
public function has($name)
    {
        $value = $this->get($name);

        return isset($value) ? $value : false;
    }
536766
public function __isset($name) {
        if(isset($this->tmp[$name])) {
            return true;
        }
        if (method_exists($this, '_' . $name)) {
            return true;
        }
        if (isset($this->row[$name])) { //array_key_exists($name, $this->_row)
            return true;
        }
        if(isset($this->stack[$name])){
            $this->row = &$this->stack;
            return true;
        }
        return false;
    }
1093992
public function __isset(string $name): bool
    {
        $setter = [$this, 'set' . strtolower($name)];
        $getter = [$this, 'get' . strtolower($name)];

        return is_callable($setter) || is_callable($getter);
    }
630166
public function __isset($name)
    {
        $getterMethod = 'get' . ucfirst($name);
    
        if (!method_exists($this, $getterMethod)) {
            return false;
        }
    
        return (($this->$getterMethod() !== null) ? $this->$getterMethod() : false);
    }
858673
public function field($name)
  {
    return isset($this->fields[$name]) ? $this->fields[$name] : false;
  }
699895
public function __isset($name)
    {
        return ($name && parent::__isset($name)) || isset($this->params[$name]);
    }
85680
public function __isset($name)
    {
        $camelizeName = $this->__buildCamelizeName($name);

        $getter = 'get' . $camelizeName;
        if (method_exists($this, $getter))
        {
            return null !== $this->$getter();
        }
        else
        {
            return false;
        }
    }
1161117
public function __isset($name) {
        switch ($name) {
            case 'id':
                return isset($this->_id);
            case 'contextlevel':
                return isset($this->_contextlevel);
            case 'instanceid':
                return isset($this->_instanceid);
            case 'path':
                return isset($this->_path);
            case 'depth':
                return isset($this->_depth);
            case 'locked':
                // Locked is always set.
                return true;
            default:
                return false;
        }
    }
1297284
public function isFieldSet(string $name) : bool
    {
        if (!$this->fetchForm()) {
            return false;
        }

        $name      = trim($name);
        $field_key = array_search($name, $this->keys);
        return isset($this->method[$field_key]) ?: isset($_FILES[$field_key]);
    }
1251580
public function __isset($name)
	{
		return !parent::__isset($name) ? isset($this->data[$name]) : TRUE;
	}
275524
public function __isset( $name )
    {
        return ( isset( $this->properties[$name] ) || isset( $this->storageOptions->$name ) );
    }