如何检查symfony2中是否已经存在某个文件？

Question

I am working on symfony2 and currently I want to check if a file does exist. My scenario look something like this,, I have two files excel file and the docx file. If a person have an excel file for her/his transaction then it is automatically that the docx file is not applicable for her or him.And vice versa. How can I possibly do it in symfony2 ? A lot in the net but I don't know how to do it in my case,, thanks a lot :)

UPDATE Controller:

public function documentType ($doc_type) {
   $em = $this->getDoctrine()->getEntityManager();
   $result = $em->getRepository('SupplierBundle:SupplierTransactionDetails')->findDocumentType('xlsx');
   $result1 = $em->getRepository('SupplierBundle:SupplierTransactionDetails')->findDocumentType('docx');
   // statement that will know if the file exists for that certain user if so the other document type will be not applicable for that user. Example: that user have docx file already then the xlsx will be N/A and vice versa

} 

Repository :

public function findDocumentType ($doc_type) {
   $em = $this->getEntityManager();
   $query = $em->createQuery(
       'SELECT a, b, c FROM SupplierBundle:SupplierTransaction Details a
        JOIN a.supplierTransaction b
        JOIN b.supplierDocType c
        WHERE c.docType LIKE :doc_type'
   )->setParameter('doc_type', $doc_type);

   return $query->getResult();
}

Answer 1

You can just use plain PHP for this. For example:

$xls = 'sheet.xlsx';
$doc = 'document.docx';

if (file_exists($xls)) {
    // User has an XLSX file
    echo 'Download your sheet <a href="sheet.xlsx">here</a>.';
} elseif (file_exists($doc)) {
    // User has a DOCX file
    echo 'Download your document <a href="document.docx">here</a>.';
}

Answer 2

If you want to do it the Symfony2 way, you can use the Filesystem class, it has an exists() function. In a controller an instance is automatically available in the service container:

$em = $this->getDoctrine()->getManager();
$xlsx = $em->getRepository('SupplierBundle:SupplierTransactionDetail')->findDocumentType‌('xlsx');
$docx = $em->getRepository('SupplierBundle:SupplierTransactionDetail')->findDocumnetType‌('docx');

return [
        'xlsx' => $xlsx instanceof SupplierTransactionDetail && $this->get('filesystem')->exists($xlsx->getFile()) ? $xlsx->getFile() : null,
        'docx' => $docx instanceof SupplierTransactionDetail && $this->get('filesystem')->exists($docx->getFile()) ? $docx->getFile() : null,
    ];

In your twig template:

{% if xlsx is not empty %}
    {{ xlsx }}
{% endif %}

{% if docx is not empty %}
    {{ docx }}
{% endif %}