Question 166586 in Wordpress Question posted in
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Can PHP extract a filename from a string & use it to delete a WordPress file?

How can we check if a string, which contains words has a URL that starts with something like https://example.com/wp-content/uploads/Chat/...

If it matches, then extract the child directory and the filname filename, and then delete the file from server.

For example, if a string is of form: "Bla Bla Bla https://example.com/wp-content/uploads/Chat/IMG/Abc.pdf Bla Bla Bla Bla"

then check if the string contains a URL that starts with https://example.com/wp-content/uploads/Chat/

If it does, then extract the directory (IMG) it can be IMG or Video or Document, and end filename that is Abc.pdf

Then delete the file Abc.pdf

Here’s What I tried

I used a regex expression, in PHP to match the starting URL. However I cant figure out how to extract the filename from it, as filename is in the string, and then how to delete the file.

^https://example.com/wp-content/uploads/Chat
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2

Answers


  1. 0

    Use the following to code to get the file names in an array from string.

    <?php
$string = "Bla Bla Bla https://example.com/wp-content/uploads/Chat/IMG/Abc.pdf Bla Bla Bla Bla Bla https://example.com/wp-content/uploads/Chat/IMG/XYZ.pdf Bla Bla Bla Bla";
preg_match_all('#bhttps?://[^,s()<>]+(?:([wd]+)|([^,[:punct:]s]|/))#', $string, $match);
$all_filenames = array();
for ($i = 0; $i < count ($match[0]); $i++)
{
    $url = $match[0][$i];
    $filename = substr($url, strrpos($url, '/') + 1);
    array_push($all_filenames, $filename);
}
echo "<pre>";
print_r($all_filenames); 
echo "</pre>";
?>
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  2. 0

    You were already half way their. Regex is the only logical way to move forward in it.

    Using regex, I search for the beginning url

    Then I assign the last directory and file name to a variable $File.

    $File[1] = Last Directory

    $File[3] = FileName

            $message = "Bla Bla Bla https://example.com/wp-content/uploads/Chat/IMG/Abc.pdf Bla Bla Bla Bla Bla https://example.com/wp-content/uploads/Chat/IMG/XYZ.pdf Bla Bla Bla Bla";
        $Match = false;
        if(preg_match('/https://milyin.com/wp-content/uploads/Chat/(IMG|Video|Document)(/)([0-9A-Za-z_-]+.[A-Za-z]{3,4})/', $message)){
            $Match = true;
            preg_match('/https://example.com/wp-content/uploads/Chat/(IMG|Video|Document)(/)([0-9A-Za-z_-]+.[A-Za-z]{3,4})/', $message, $File);
            if(isset($File[1]) && isset($File[3])){
                $FileName = ABSPATH . "wp-content/uploads/Chat/" . $File[1] . '/' . $File[3];
                unlink($FileName);
            }
        }
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