Custom PHP script throws critical error ONLY when editing page

Question

Custom PHP script throws critical error ONLY when editing page

Phipsen

2022年4月26日 07:20

I have the following script added to functions.php in my child theme:

function getlatestfile() { 
    $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator('wp-content/uploads/cams/'));
    foreach ($iterator as $file) {
        if ($file-isDir()) continue;
        $path = $file-getPathname();
    }
    return img src='https://mysite.url/ . $path . ' /;
}
// register shortcode
add_shortcode('getfieldimage', 'getlatestfile');

I can save the code, insert the shortcode [getfieldimage] on the page, and the page indeed displays the latest image. No complains. But when trying to edit again the page containing the shortcode, WP tells me that there's a critical error, and wants me to go to https://wordpress.org/support/article/faq-troubleshooting/ . Cannot get any helpful info there.

Topic scripts php Wordpress

Category Web

Phipsen · Accepted Answer · 2022年4月26日 07:20

ABSPATH helps to display the page in the backend in editmode. But for the frontend, the path for the <img../> tag needs to be modified. cutprefix() function (taken from here) does the job.

This is the working solution for the front- and backend:

function getlatestfile() {

  $iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator( ABSPATH . 'wp-content/uploads/cams' ));
  foreach ($iterator as $file) {
    if ($file->isDir()) continue;
    $path = $file->getPathname();
  }
  $path = cutprefix($path, '/home/username/web/mysite.url/public_html/');
  return("<img src='https://mysite.url/" . $path . "' />");
}


function cutprefix($str, $prefix){
  if (substr($str, 0, strlen($prefix)) == $prefix) {
    $str = substr($str, strlen($prefix));
  } 
  return $str;
}

Thanks to Pat J for leading me in the right direction.

Pat J · Accepted Answer · 2022年4月20日 15:35

When you're editing the page, you're in the directory wp-admin, and wp-admin doesn't contain wp-content (they're both children of your site's root directory).

Instead of 'wp-content/uploads/cams/', I'd recommend ABSPATH . 'wp-content/uploads/cams/' which should work wherever you might be in the WordPress environment.

Custom PHP script throws critical error ONLY when editing page

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