PHP Get height and width in Pdf file proprieties
<?php
$output = shell_exec("pdfinfo ".$pdflivrelink);
$data = explode("n", $output); //puts it into an array
for($c=0; $c < count($data); $c++) {
        if(stristr($data[$c],"Pages") == true) {
        $pagesnumber = trim(substr($data[$c],6));
        }
        if(stristr($data[$c],"Page size") == true) {
            $pagesize_H = height_pdf(trim(substr($data[$c],9)));
        }
        if(stristr($data[$c],"Page size") == true) {
            $pagesize_L = width_pdf(trim(substr($data[$c],9)));
        }

}
function height_pdf($size){
$hauteur = round(substr($size,7,7)/2.83);
return $hauteur;
}
function width_pdf($size){
$largeur = round(substr($size,17,7)/2.83);
return $largeur;
} ?>

$output = shell_exec("pdfinfo ".$pdflivrelink);
    $data = explode("n", $output); //puts it into an array
    for($c=0; $c < count($data); $c++) {
            if(stristr($data[$c],"Pages") == true) {
            $pagesnumber = trim(substr($data[$c],6));

            }
            if(stristr($data[$c],"Page size") == true) {
                echo $data[$c];
    preg_match('/Page size: ([0-9]*.?[0-9]?) x ([0-9]*.?[0-9]?)/', $data[$c], $matchess);
    $width = round($matchess[1]/2.83);
    $height = round($matchess[2]/2.83);

            }
}
echo "width = $width<br>height = $height";

<?php
$str = 'Creator: pdftk 1.41 - www.pdftk.com Producer: iText 2.1.5 (by lowagie.com) CreationDate: Mon Feb 27 13:18:23 2012 ModDate: Mon Feb 27 16:26:12 2012 Tagged: no Pages: 36 Encrypted: no Page size: 425.2 x 538.582 pts File size: 5097597 bytes Optimized: yes PDF version: 1.6';

preg_match('/Page size: ([0-9]*.?[0-9]?) x ([0-9]*.?[0-9]?)/', $str, $matches);
$width = round($matches[1]/2.83);
$height = round($matches[2]/2.83);

echo "width = $width<br>height = $height";
?>

<?php

$output = shell_exec("pdfinfo ".$pdflivrelink);

// find page count
preg_match('/Pages:s+([0-9]+)/', $output, $pagecountmatches);
$pagecount = $pagecountmatches[1];

// find page sizes
preg_match('/Page size:s+([0-9]{0,5}.?[0-9]{0,3}) x ([0-9]{0,5}.?[0-9]{0,3})/', $output, $pagesizematches);
$width = round($pagesizematches[1]/2.83);
$height = round($pagesizematches[2]/2.83);

echo "pagecount = $pagecount <br>width = $width<br>height = $height";

?>

// Debugging:
$output = shell_exec("pdfinfo ".$pdflivrelink);
var_dump($output);

// Dimension:
preg_match('~ Page size: ([0-9.]+) x ([0-9.]+) pts ~', $output, $matches);
var_dump($matches);


// No of pages:
preg_match('~ Pages ([0-9]+) ~', $output, $matches);
var_dump($matches);

function size_pdf($size){
    $result = array();
    $tmp = exlode('x', $size);
    $result['height'] = round(trim($tmp[0])/2.83);
    $result['width'] = round(trim($tmp[1])/2.83);

    return $result;
}