Is there a recommended approach or library to use for validating PDF files in PHP?

When validating PDF files in PHP, one recommended approach is to use a library like `TCPDF` or `FPDI` which provide functions for parsing and validating PDF files. These libraries can help check the structure and content of the PDF file to ensure it meets certain criteria or standards. By using these libraries, you can easily validate PDF files in your PHP application. 

// Example using TCPDF library for validating PDF file
require_once('tcpdf_include.php');

$pdf = new TCPDF();
$pdf->setSourceFile('example.pdf');

// Check if the PDF file is valid
if ($pdf->getNumPages() > 0) {
    echo 'PDF file is valid.';
} else {
    echo 'PDF file is not valid.';
}

Keywords

PDF validation library PHP approach

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