Fix filter_input() return value documentation #5231
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Fixes php#4361 - The function returns null when the variable is not set, not false. False is only returned when the filter fails validation. Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Fixes #4361 - The function returns null when the variable is not set, not false. False is only returned when the filter fails validation.