Calling a Second Controller With Functions

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$this->getChild('controller/module/common_functions.php'); 

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$this->getChild('module/common_functions.php');

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include_once 'controller/module/common_functions.php';
$this->FunctionIwantToCall(); 

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// OpenCart 1.x
$this->children = array(
    'directory/file/method'
);

// OpenCart 2.x
$data['foo'] = $this->load->controller('directory/file/method');
 

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// OpenCart 1.x
$this->children = array(
    'common/header',
    'catalog/product/review'
);

// OpenCart 2.x
$data['header'] = $this->load->controller('common/header');
$data['review'] = $this->load->controller('catalog/product/review');
 

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// OpenCart all versions
$this->load->model('directory/file');
$this->model_directory_file->methodCall($prams);
 

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$this->load->model('catalog/prodct');
$this->model_catalog_product->getProduct($product_id);