Title: Odd Problem Invoking PHP Method
Last modified: August 31, 2016

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# Odd Problem Invoking PHP Method

 *  [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/)
 * I’m working on a new theme based on a theme that has worked well for years. But
   an odd problem has occurred. I issue a call to a method. The code after the call
   is exectued. But the method code itself doesn’t get executed. I added some echo
   and die statements to illustrate the problem. Here is the code involing te method:
 *     ```
       echo "Calling getByDateOrder";
             $donorfile->getByDateOrder($fdate);
             die("Called getByDateOrder");
       ```
   
 * Here is the invoked code:
 *     ```
       public function getByDateOrder($fdate) {
                    global wpdb$;
                    die("getByDateOrder entered");
                    $query="SELECT * FROM ncrj_donors WHERE lgdate >= '$fdate' ORDER BY lgdate";
                    $this->qstring=$query;
                    $this->qstring=$query;
                    $wpdb->query($query) or die("getByDateOrder Failed");
                    $num=wpdb->num_rows;
                    $this->i=0;
       	     $this->lmt=$num;
                    if ($num==0) {
                       return false;
                       }
                    $this->result=$wpdb->get_row($query) or die("Donor Query Failed");
                    $this->readIt();
                    return true;
                }
       ```
   
 * The code after the die statement shouldn’t matter.
 * But here is the result:
 * Calling getByDateOrderCalled getByDateOrder
 * I’ve never encountered a problem like this before. Has anyone else? any suggestions
   about how to debug?
 * -Bob Chatelle

Viewing 13 replies - 1 through 13 (of 13 total)

 *  [RossMitchell](https://wordpress.org/support/users/rossmitchell/)
 * (@rossmitchell)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999661)
 * Are you sure that the variable `$donorfile` is on object of the type which has
   the member function `getByDateOrder` ?
    Using: `print_r($donorfile);` will show
   you everything about it.
 * Also be very careful using variables like `$fdate`
    If you have calculated $fdate
   in your own code then you might be safe, but if it is using user input, then 
   what happens when someone enters a date like: `0 ; drop table;` Best practice
   is to validate your inputs and use prepare.
 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999715)
 * What Ross said.
 * Additionally, the `getByDateOrder()` method has a couple typographic errors.
   
   You have `global wpdb$;` It should be `global $wpdb;`
 * `$this->qstring=$query;` appears twice. No harm, but unnecessary.
 * When developing code you will want `WP_DEBUG` defined as `true` in wp-config.
   php. Then you will be notified of problems like calling methods of non-objects.
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999730)
 * Thanks for the link! I’ll check it out.
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999731)
 * Ignore my prior post. It was meant for another thread.
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999734)
 * Thanks for the suggestions! I haven’t worked with PHP for years and I am quite
   rusty.
 * This is my new calling logic:
 *  echo “Calling getByDateOrder from date is $fdate”;
    print_r($donorfile); $donorfile-
   >getByDateOrder($fdate); die(“Called getByDateOrder”);
 * This is the method called:
 *  public function getByDateOrder($fdate) {
    global $wpdb; die(“getByDateOrder 
   entered”); $query=”SELECT * FROM ncrj_donors WHERE lgdate >= ‘$fdate’ ORDER BY
   lgdate”; $this->qstring=$query; $wpdb->query($query) or die(“getByDateOrder Failed”);
   $num=wpdb->num_rows; $this->i=0; $this->lmt=$num; if ($num==0) { return false;}
   $this->result=$wpdb->get_row($query) or die(“Donor Query Failed”); $this->readIt();
   return true; }
 * This is the result:
 * Calling getByDateOrder from date is 2016-01-01Donor Object ( [title] => [fname]
   => [qstring] => [lname] => [addr1] => [addr2] => [city] => [state] => [zipcode]
   => [donorkey] => [mname] => [name2] => [lgdate] => [phone] => [fax] => [email]
   => [comment] => [noslct] => [gift] => [result:Donor:private] => [lmt:Donor:private]
   => [i:Donor:private] => )
    Notice: Trying to get property of non-object in /home5/
   forthill/public_html/_donors/donor.php on line 224 Called getByDateOrder
 * The line 224 error doesn’t appear to be relevant. It is in another routine and
   a routine that works. The method still never seems to get invoked,
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999828)
 * It seems obvious that the called public function is not being executed because
   the first statement in it is a die command.
 * When I’ve had problems like this with other code (not php) in the past, it has
   usually turned out to be some kind of caching problem. Is that possible here?
   I can’t come up with any other explanation.
 * -Bob Chatelle
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999835)
 * I have another account with my ISP. I created a new directory in this account
   and recreated all of my files and logic there.
 * The problem disappears.
 * But I suspect, if it is a caching problem, it will reappear.
 * How do I get rid of these php caching problems?
 * When I worked with PHP years ago I don’t remember having them.
 * -Bob Chatelle
 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999850)
 * It depends on what caching is causing the problem. WP has some internal caching,
   but it’s extremely rare for it to cause issues like this. If you have a caching
   plugin, you of course could disable it. I imagine you are referring to server
   level caching. On shared hosting, I don’t think there’s any choice, but you could
   try contacting your host to see if there’s an option.
 * If you have a virtual private server then you can control the caching by either
   the configuration file or the mods-enabled folder.
 * Perhaps the best way around this would be to develop locally. Once you start 
   doing this, you’ll never go back 🙂
 * Are you sure the account where the problem disappeared has an accurately recreated
   installation? By having different plugins or themes activated, you could be causing
   conflicts on one site that do not exist in the second.
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999859)
 * I have contacted my ISP to see if they can shed some light on this.
 * MY code can continue to live in the account and directory where it is now working.
   But I would like to know the cause of the problems.
 * As far as I know the recreation was accurate. Depending on what my ISP advises,
   I may just delete/recreate everything on the problem site.
 * -Bob
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999865)
 * While I’ve done little coding thes past few years, problems like this demonstrate
   the advantages of developing locally. Googleing about, I se there are different
   approaches for installing a server, wordpress, etc. locally. Do you have any 
   recommendations?
 * -Bob
 *  [RossMitchell](https://wordpress.org/support/users/rossmitchell/)
 * (@rossmitchell)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999872)
 * Yes developing locally is very helpful.
    My advice is to use the “VirtualHost”
   technique descripde here: [http://httpd.apache.org/docs/2.2/vhosts/name-based.html](http://httpd.apache.org/docs/2.2/vhosts/name-based.html)
   And here: [http://en.wikipedia.org/wiki/Hosts_%28file%29](http://en.wikipedia.org/wiki/Hosts_%28file%29)
 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999874)
 * This just came up in another topic. My own experience is explained there:
    [https://wordpress.org/support/topic/prevent-redirect-in-register-page-when-user-is-logged-in?#post-7962801](https://wordpress.org/support/topic/prevent-redirect-in-register-page-when-user-is-logged-in?#post-7962801)
 *  Thread Starter [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * (@bobchatelle)
 * [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999877)
 * Thanks for all the info! I will explore.
 * -Bob

Viewing 13 replies - 1 through 13 (of 13 total)

The topic ‘Odd Problem Invoking PHP Method’ is closed to new replies.

 * In: [Hacks](https://wordpress.org/support/forum/plugins-and-hacks/hacks/)
 * 13 replies
 * 3 participants
 * Last reply from: [bobchatelle](https://wordpress.org/support/users/bobchatelle/)
 * Last activity: [10 years, 2 months ago](https://wordpress.org/support/topic/odd-problem-invoking-php-method/#post-6999877)
 * Status: not resolved

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