<http://forum.pspad.com/read.php?f=2&i=11905&t=11905> 
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In PHP a variable name must follow the folowing rule (expresed as a
RegExp):
[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*

which contrast to most programming languages whose variable naming rule
is:
[a-zA-Z_][a-zA-Z0-9_]*

Code Explorer only recognice variables that follow the second rule. So
that some valid variables in PHP are not properly parsed.

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