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Yes, both versions are comparable with respect to validating the gender. To use the NULL coalescing operator in Script 2.4, you'd probably just write it like your version of Script 2.3 (note that you don't need the $gender = NULL in there though).1 point
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I wouldn't say that line is necessary. The $gender variable is already assigned a value before being used so assigning it a "false" value has no impact.1 point