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Editorial Team
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Asked: 2026-05-26T16:27:32+00:00

This question straddles both programming and server issues, not sure it is 100% for

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This question straddles both programming and server issues, not sure it is 100% for serverfault. Here it goes:

I just migrated my Codeigniter (PHP 5.1.2) web app to a new server. In the old server, everything worked normally.

In the new server, all jQuery Ajax is broken, and I’ve noticed errors affect exclusively Ajax that uses json data.

The errors on Firebug show as

data is null //data is a json string returned by the server
    if (data.success == 1) {

and on Chrome console the same error shows as

Uncaught TypeError: Cannot read property 'success' of null

A few details about the new server:

  • Red Hat Enterprise Linux
  • Plesk 9
  • PHP is enabled via Plesk interface – the setting is ‘Run PHP as Fast CGI, safe_mode off’
  • It has a firewall that is not causing any obvious problems

  • .htaccess is currently very lean

    RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php?/$1 [L]

Header set X-UA-Compatible "IE=EmulateIE8"

<IfModule mod_deflate.c>
    <IfModule mod_setenvif.c>
        BrowserMatch ^Mozilla/4 gzip-only-text/html
        BrowserMatch ^Mozilla/4\.0[678] no-gzip
        BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
        BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html
    </IfModule>
    <IfModule mod_headers.c>
        Header append Vary User-Agent env=!dont-vary
    </IfModule>
    AddOutputFilterByType DEFLATE text/css application/x-javascript text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon
</IfModule>

<IfModule mod_headers.c>
<FilesMatch "\.(jpg|jpeg|ico|gif|png|flv|pdf)$">
  Header set Cache-Control "max-age=2700"
</FilesMatch>
</IfModule>

In addition:

  • one part of the webapp uses jQuery FullCalendar – before the migration it worked perfectly – now I get a blank page (no errors on console – but it uses several JSON strings to populate calendar events
  • login using Facebook and Google credentials is broken leading to blank pages (not sure of JSON strings here).

I’ve tried changing json to jsonp as suggested elswhere on SO, but this didn’t solve the problem. Is any other change to the code required?

Thanks for reading — any suggestions how to begin troubleshooting this?

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1 Answer

  1. Editorial Team

    This was resolved by upgrading my PHP version from 5.1.2 (the default install for Plesk 9.5) to PHP 5.3.x.

    http://www.atomicorp.com/wiki/index.php/PHP

    The problem was probably due to my using json_encode, which is a PHP > 5.2 function.

    Hope this helps anyone out there with similar issues.

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