PHP 4 try catch alternative?

Question

Could someone help me translate this code to PHP 4?

try
{
  $picture = PDF_open_image_file($PDF, "jpeg", $imgFile, "", 0); // This is the original statement, this works on PHP4
}
catch(Exception $ex)
{
  $msg = "Error opening $imgFile for Product $row['Identifier']";
  throw new Exception($msg);
}

Basically when there is a fatal error I need to get the $row['Identifier'] so I know what product is causing the error.

Thanks in advance.

EDIT: I don't know what PHP_open_image_file does, but sometimes I get errors like below, and I need to get the product identifier that is causing the error.

Fatal error: PDFlib error [1016] PDF_open_image_file: Couldn't open JPEG file 'picture/b01_le1x.jpg' for reading (file not found) in /var/www/html/catalogue/pdf_make.php on line 618

Answer 1

Am I correct in assuming you are using PDF_open_image_file() from the pdflib PECL extension?

If so, then it will never throw an exception on PHP 4. I would assume error states are reported through the result, which is an int and thus probably < 1 in case of errors.

//try
if (file_exists($imgFile)) {
    $picture = PDF_open_image_file($PDF, "jpeg", $imgFile, "", 0);
}

//catch
if (!$picture) {
   $msg = "Error opening $imgFile for Product $row['Identifier']";
   print $msg;
}

I've updated this with file_exists to prevent your fatal error.

As addendum question, why were you trying to rethrow an exception on PHP4?