Description:
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From manual page: http://www.php.net/language.types.boolean
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Evaluation of boolean expressions leads to conflicting (and incorrect) results.

Test script:
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$ctm = true and (false or false);
var_dump ($ctm, true and (false or false));

returns true, false

Expected result:
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Should return false, false, and does in fact return this if the expression that is assigned to $ctm is enclosed in brackets.