File::exists() 

\nn\t3::File()->exists($src = NULL); 

Checks whether a file exists. Returns the absolute path to the file.

\nn\t3::File()->exists('fileadmin/image.jpg');
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Also exists as ViewHelper:

{nnt3:file.exists(file:'path/to/image.jpg')}
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| @return string|boolean

Source Code 

public function exists($src = null)
{
	if (file_exists($src)) return $src;
	$src = $this->absPath($src);
	if (file_exists($src)) return $src;
	return false;
}
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