Cake\View\Helper\FormHelper::_inputType PHP Method

    protected function _inputType($fieldName, $options)
    {
        $context = $this->_getContext();
        if ($context->isPrimaryKey($fieldName)) {
            return 'hidden';
        }
        if (substr($fieldName, -3) === '_id') {
            return 'select';
        }
        $internalType = $context->type($fieldName);
        $map = $this->_config['typeMap'];
        $type = isset($map[$internalType]) ? $map[$internalType] : 'text';
        $fieldName = array_slice(explode('.', $fieldName), -1)[0];
        switch (true) {
            case isset($options['checked']):
                return 'checkbox';
            case isset($options['options']):
                return 'select';
            case in_array($fieldName, ['passwd', 'password']):
                return 'password';
            case in_array($fieldName, ['tel', 'telephone', 'phone']):
                return 'tel';
            case $fieldName === 'email':
                return 'email';
            case isset($options['rows']) || isset($options['cols']):
                return 'textarea';
        }
        return $type;
    }