How to check if a pdf file is blank using php?

@muriel.schmidt 

You can check if a PDF file is blank by using the following code in PHP:

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$pdfFile = 'file.pdf';
$content = file_get_contents($pdfFile);

if (trim($content) == '') {
    echo 'PDF file is blank';
} else {
    echo 'PDF file is not blank';
}

This code reads the contents of the PDF file using file_get_contents and then checks if the content is empty by t******* any whitespace. If the content is empty, it means the PDF file is blank.