Re: Class code refuses to run

You can inspect the maybe faulty response coming from php by using the web
dev console (Ctrl + i). In the network tab is the async call from ajax with
its response. Or did you do this already?

Additionally xdebug dumps php errors in a little nicer format.

JEFFRY KILLEN <[email protected]> schrieb am Di., 10. Aug. 2021, 20:13:

>
>
> > On Aug 10, 2021, at 10:19 AM, Ashley Sheridan <[email protected]>
> wrote:
> >
> >
> > On 10/08/2021 17:43, JEFFRY KILLEN wrote:
> >>
> >>> On Aug 10, 2021, at 12:12 AM, Ashley Sheridan <
> [email protected]> wrote:
> >>>
> >>>
> >>>
> >>> On 10 August 2021 01:36:01 BST, JEFFRY KILLEN <[email protected]>
> wrote:
> >>>> Hello;
> >>>>
> >>>> I have a web page I am developing.
> >>>>
> >>>> It has images embedded in it.
> >>>>
> >>>> The src attribute is ./?tag=guitar&amp;type=img
> >>>>
> >>>> The php code from the html file is:
> >>>> </php
> >>>> // preliminary irrelevant code
> >>>> require_once('php/imageServer.php');
> >>>>
> >>>> if($_GET['tag'])
> >>>> {
> >>>>  //// file_put_contents('test.txt', "Hello?...img...");
> >>>> /*
> >>>> the following was working before I expanded it out to running code as
> written.
> >>>> it still should work.
> >>>> (new _IMG_SERV())->serv($_GET);
> >>>> */
> >>>>   $_x = new _IMG_SERV();
> >>>>   $_x->serv($_GET);
> >>>> }
> >>>> ?>
> >>>>
> >>>> the serv method in the class is
> >>>>
> >>>> public function serv($_a)
> >>>>             {
> >>>>              file_put_contents('test.txt', "Hello?...img...");
> >>>>              switch($_a['type'])
> >>>>                {
> >>>>                 case 'img':
> >>>>                 header('Content-Type: image/jpeg');
> >>>>
>  imagedestroy(imagejpeg(imagecreatefromjpeg(self::$_imgDir.self::$_imgIndex[$_a['tag']])));
> >>>>                 break;
> >>>>                 case 'txt':
> >>>>
>  if(file_exists(self::$_imgDir.self::$_txtIndex[$_a['tag']]['img']))
> >>>>                   {
> >>>>                    header('Content-Type: image/jpeg');
> >>>>
> imagedestroy(imagejpeg(imagecreatefromjpeg(self::$_txtIndex[$_a['tag']]['img'])));
> >>>>                   }
> >>>>                 else
> >>>>                   {
> >>>>                    /*
> >>>>                     create text image, save for future ref and serve
> >>>>                    */
> >>>>                   }
> >>>>                 break;
> >>>>                }
> >>>>             }
> >>>>
> >>>> This HAS all been working up to a point. BUT the serv function is now
> refusing to run.
> >>>> There are no php, javascript or html related errors.
> >>>>
> >>>> You will see 'file_put_contents('test.txt', "Hello?...img...");'
> >>>> Because this is an async request for a resource I cannot use print or
> echo to sample
> >>>> code progress. So I have strings written to a text file. The call to
> file_put_contents('test.txt', "Hello?...img...");
> >>>> in the top of the serv method is not running. It IS running in the
> top of the get conditional in the index page
> >>>> if I uncomment it.
> >>>>
> >>>> Does anyone know why apache and/or php, and/or possibly the browser
> would fail to serve a resource
> >>>> like this when it so far has been working most of the day today? I
> cannot see anything I have done wrong.
> >>>> data:
> >>>> MacOS High Sierra, apache on localhost
> >>>> Thank you for time and attention;
> >>>> JK
> >>> You say there are no errors, but presumably that just means none being
> displayed? Have you looked at the error logs?
> >>>
> >>> Also, the imagedestroy calls here aren't really necessary, as you
> should be exiting immediately after outputting the image data.
> >> I don't have my server set up to log errors. It is a dev server on
> local host.
> >> I use Firefox as dev/test browser. It has dev tools, one of which is
> network.
> >> The requests for image resources represented by the get queries are
> returning
> >> 200, ok. and the image is not displayed. Only the alt string is
> displayed.
> >>
> >> However I did make some subtile changes just before the problem
> appeared. I am going to roll back those
> >> changes and see what happens. The changes should not be invalid. It
> just amounts to when the php script
> >> has a full version of resource path.
> >>>> self::$_imgDir.self::$_imgIndex[$_a['tag']]
> >> Where self::@_imgDir is a string representing the directory location
> >> and self::$_imgIndex[$_a['tag']] is the file name.
> >> I used to have the complete path/file name in self::$_imgIndex.
> >> self::$_imgIndex is set with the contents of an external php script
> that is required by the class __construct method.
> >>
> >> Thank you for time and attention
> >> JK
> >
> > Turn on error logs locally, they're absolutely essential for local
> development. There's also a pretty good case to turn on the display of
> errors locally too (which is different from error logging to a log file).
> >
> > As for the image, you say you see the alt text, but you shouldn't see
> that if you're requesting only the image, as the alt attribute it part of
> the HTML, and you can't send mixed content via the same request with PHP
> that I'm aware of.
> >
> > --
> > Ashley Sheridan
> > https://www.ashleysheridan.co.uk
>
> I do get php error displayed locally. But not for async requests in the
> usual manner.
>
> The alt attribute of the img tag is html. It is what is displayed if the
> image does
> not arrive at the browser, as in case the server cannot find the file. Or
> in this
> case the image is not being sent. The image is not being sent because the
> serv method is being blocked from executing.
>
> if the php interpreter is doing background security audits why did it take
> so
> many test runs for it to decide the code was insecure or otherwise
> objectionable?
>
> I did roll back the subtile changes mentioned in my earlier response with
> no improvement.
>
> When I work with 'ajax' async requests often errors generated by php are
> included
> in the response and are not displayed in lew of the html. So logging would
> capture these errors?
>
> Thank you for your responses;
> JK
>