การหาจำนวนหน้าไฟล์ PDF ที่เราอัฟโหลดขึ้นไป จาก PHP

$PDFPath = "myfile/".$_FILES["filUpload"]["name"];
$stream = fopen($PDFPath, "r");
$PDFContent = fread ($stream, filesize($PDFPath));
if(!$stream || !$PDFContent)
    echo "Not Read";
    
$firstValue = 0;
$secondValue = 0;
if(preg_match("/\/N\s+([0-9]+)/", $PDFContent, $matches)) {
    $firstValue = $matches[1];
}
 
if(preg_match_all("/\/Count\s+([0-9]+)/s", $PDFContent, $matches))
{
    $secondValue = max($matches[1]);
}
$page = ($secondValue != 0) ? $secondValue : max($firstValue, $secondValue);