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Programming PHP, 3rd Edition by Peter MacIntyre, Kevin Tatroe, Rasmus Lerdorf

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Name

array_change_key_case

Synopsis

array array_change_key_case(array array[, CASE_UPPER|CASE_LOWER])

Returns an array whose elements’ keys are changed to all uppercase or all lowercase. Numeric indices are unchanged. If the optional case parameter is left off, the keys are changed to lowercase.

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