Warnings appearing upon “save settings”

I investigated the issue further, and believe I have found the root problem as well as a possible solution (see code below).

It seems the plugin may not be fully compatible with PHP 5.4 and higher, as PHP changed their warning message when functions are passed arrays vs. strings, as is discussed here:

https://stackoverflow.com/questions/15361392/how-do-i-correct-this-illegal-string-offset

Further, this same issue may be an underlying cause of the “arrow spins endlessly” issue reported previously, which I am also experiencing:

https://www.ads-software.com/support/topic/email-sends-yet-the-arrow-spins-indefinitely/#post-9114560

An approach that worked for me (which fixed both this “warnings upon save” issue as well as the “arrow spins indefinitely” issue was to make a few adjustments to explicitly check for array on lines 1302, 1306, 1308 and 1355 of the file /mpdf/classes/cssmgr.php as follows:

Line 1302
------------------
Original:
if (!isset($attr['ID'])) {
UPDATED:
if (is_array($attr) && !isset($attr['ID'])) {


Line 1306
------------------
Original:
if (!isset($attr['LANG'])) {
UPDATED:
if (is_array($attr) && !isset($attr['LANG'])) {


Line 1308
------------------
Original:
} else {
UPDATED:
} else if (is_array($attr)) {


Line 1355
------------------
Original:
$this->_mergeFullCSS($this->cascadeCSS, $this->mpdf->blk[$this->mpdf->blklvl]['cascadeCSS'], $tag, $classes, $attr['ID'], $attr['LANG']);
UPDATED:
$this->_mergeFullCSS($this->cascadeCSS, $this->mpdf->blk[$this->mpdf->blklvl]['cascadeCSS'], $tag, $classes, (is_array($attr) && isset($attr['ID']))?$attr['ID']:'', (is_array($attr) && isset($attr['LANG']))?$attr['LANG']:'');

I hope the plugin author is able to verify these issues and update the plugin with a permanent solution.

Thank you in advance.

Hi!

Thanks for your report. I fixed the notices errors.

Just uninstall/install plugin or replace files by FTP.

Thanks