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

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Name

array_reduce

Synopsis

mixed array_reduce(array array, mixed callback[, int initial])

Returns a value derived by iteratively calling the given callback function with pairs of values from the array. If the third parameter is supplied, it, along with the first element in the array, is passed to the callback function for the initial call.

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