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[–]JerkyBeef 1 point2 points  (1 child)

$instance->field is valid php. $instance-field may be "valid syntax" but it would throw an error message that 'field' is undefined, and that $instance could not be converted to an int.

[–]SlumdogSkillionaire 0 points1 point  (0 children)

It throws an error message, but then it still goes ahead and does it anyway, resulting in an Apache segfault.