Symptom: Expression Engine installations older than version 1.3.1 generate an "Only variable references should be returned by reference" error.
Problem: Certain coding within Expression Engine versions prior to 1.3.1 is not compatible with php 4.4.x.
Solution: Update to Expression Engine version 1.3.1 at a minimum. The knowledgebase article related to this issue from Expression Engine is located at http://www.pmachine.com/ee/knowledgeblog/notice_only_variables_should_be_assigned_by_reference_in_xxxxxx/.
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