Get a value from string using regular expression in PHP - php

Question

Im just trying to get a page count from a local pdf file.
I converted the pdf to string and tried getting the page number from it.
I tried using regular expression. But im not able to perfect it.
So please help.
The below is the string text
object(setasign\Fpdi\PdfParser\Type\PdfDictionary)#2728 (1) { ["value"]=>
array(3) { ["Size"]=> object(setasign\Fpdi\PdfParser\Type\PdfNumeric)#2726
(1) { ["value"]=> int(3028) } ["Root"]=>
object(setasign\Fpdi\PdfParser\Type\PdfIndirectObjectReference)#2725 (2) {
["generationNumber"]=> int(0) ["value"]=> int(3027) } ["Info"]=>
object(setasign\Fpdi\PdfParser\Type\PdfIndirectObjectReference)#2731 (2) {
["generationNumber"]=> int(0) ["value"]=> int(3026) } } } } } }
["objects":protected]=> array(0) { } }
["pageCount":protected]=> int(96)
["pages":protected]=> array(0) { } } } ["currentReaderId":protected]=>
string(71)
"C:\xampp\files\journals\2\articles\13\submission\mergedpdf\allFiles.pdf"
["importedPages":protected]=> array(0) { } ["objectMap":protected]=>
array(0) { } ["objectsToCopy":protected]=> array(1) { ["C:\xampp\files\journals\2\articles\13\submission\mergedpdf\allFiles.pdf"]=>
array(0) { } } }
I need to get the pageCount displayed in blockquote using regularexpression.
The regular expression code below:
ob_start();
var_dump($pdf);//this was an object so i converted it to string for pattern matching.
$result = ob_get_clean();//shows the result in string.
$subject = "pageCount";
$pattern = '/^pageCount/';//pattern to match to get page count
preg_match($pattern, substr($subject,20), $matches, PREG_OFFSET_CAPTURE);
print_r($matches);

Answer 1

you could use method provided by the library, like:
$filename = 'some-file.pdf';
require_once('library/SetaPDF/Autoload.php');
// or if you use composer require_once('vendor/autoload.php');
$document = SetaPDF_Core_Document::loadByFilename($filename);
$pages = $document->getCatalog()->getPages();
$pageCount = $pages->count();
echo $pageCount;

Answer 2

I would rather loop through the object given instead of using regex for getting values out of it.
But if this is really what you need here is your regex: \["pageCount":protected\]=> int\(\d*\)
You can test it here:
https://regex101.com/r/RyGMwb/2