Checking whether a pdf file is present on the url?

Question

<?php
set_time_limit(0);
$url  = 'http://www.some.url/file.pdf';
$path = 'files/file.pdf';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($ch);
curl_close($ch);
file_put_contents($path, $data);
?>

This is the code that I use to download a particular pdf file froma given url. What if there a many files in that url by names file1.pdf, file2.pdf etc. How can I check while running a loop, when to end the loop as the files will be present up to a limited number ?

Please help!

Answer 1

Checking for 404 code:

$httpCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
if($httpCode == 404) {
    /* file NOT found */
}

Checking mime type:

$mimeType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
if($mimeType == 'application/pdf') {
    /* It IS pdf file */
}

But note, that mime type can be other, but it'll be still PDF file! Also, check mime type by your PDF files: echo them to understand what u must look for. I'm not rly sure, that code in if statement is right (it is example only)

You can call curl_get_info() right after curl_exec() .

Answer 2

pass image link inside file_get_contents();
then check using preg_match();
<?php $link = $image->img1;
$filecontent=file_get_contents($link);
if(preg_match("/^%PDF-1.5/", $filecontent)){
    echo "Valid pdf";
}else{
    echo "In Valid pdf";
}
?>

You can also check: to get last three character of your file

<?php
$img_type = substr($image->img1, -3); ?> 
<?php if(preg_match("/^%PDF-1.5/", $filecontent) || $img_type == 'pdf' ){ }?>