How do get the filename string?

Hey Guys, how can I get the string of the filename from the following:

$pathinfo = pathinfo($this->file->getName());
$filename = $pathinfo['filename'];

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When I hardcode the the filename my exec () function works perfectly but $filename doesn't appear to be a string?

exec('convert /var/www/valums/server/uploads/files/MIPS.pdf[0] /var/www/valums/server/uploads/preview/' . $filename . '.jpg');

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Thanks in advance.
the_conAsked:
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Ray PaseurConnect With a Mentor Commented:
Use var_dump() to print out the contents of $filename.   You will be able to see the data type.  If you need to cast it as a string, you might do something like this:

$pathinfo = pathinfo($this->file->getName());
$filename = (string)$pathinfo['filename'];
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Ray PaseurCommented:
Thanks for the points - it's a great question, ~Ray
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