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function b($name, &$value) 里边 $value 前面的& 是干啥的啊

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2016-06-13 12:39:411229browse

function b($name, &$value) 里面 $value 前面的& 是干啥的啊?
function b($name, &$value)  里面 $value 前面的& 是干啥的啊?

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