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Bug
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Resolution: Fixed
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Minor
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2.0.7, 2.1.4, 2.2.1, 2.3
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None
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MOODLE_20_STABLE, MOODLE_21_STABLE, MOODLE_22_STABLE, MOODLE_23_STABLE
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MOODLE_21_STABLE, MOODLE_22_STABLE
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Although it's installed by default since PHP 5.1, so 99% of sites out there will have it... I think it's ok to check for it in environmental checks.
Right now we are using it in a few (non-super-critical) places... but with MDL-30698, it will be used by forums... so better check for it @ 2.3.
Ciao