Increment and arrays creates unparsable PHP code

[skruppy]

Reproduction

Use Opt 2.1 beta 1 and execute a post-increment operation (and probably other, related operations) on arrays, like in the example below.

{u:$list.index++}

Result

This results in really wired PHP code, which ends up with a parser error.

<?php echo $ctx->_data['list']++$ctx->_data['list']++['index']++;   ?>

Parse error: syntax error, unexpected T_VARIABLE, expecting ',' or ';' in foo.tpl.php

Expected

... parseable PHP code like the following.

<?php echo $ctx->_data['list']['index']++;   ?>

Appendix

Using no arrays (from a template point of view), works. The following template creates the correct PHP code shown afterwards.

{u:$foo++}

<?php echo $ctx->_data['foo']++;   ?>

A similar problem (probably caused by the same reason) is an array assignment like the following template and compiled PHP code shows.

{$item.type is 'Location'}

<?php $ctx->_data['item']='Location'['type']='Location';   ?>

Workaroud

Create a copy of the array value and modify that copy.