Replacement: Creating a new parallel array by replacing each element with another derived from it.

替换：将每个元素替换为由它派生的另一个元素，创建新的并行数组。

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This function receives the match array as a parameter and returns a modified string that is used as a replacement.

那个函数则接收匹配到的数组作为参数，然后返回一个修改后的字符串作为替换。

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They take in a function as a parameter to use when a match is found. This function receives the match array as a parameter and returns a modified string that is used as a replacement.

你可以为preg_replace_callback指定某个函数为参数，此函数能接收匹配结果数组为参数，并将数组修改后返回，作为替换的结果。

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When a receiver will generate about 25kW of energy while costing less to make through cheaper mirrors and structures, a fully developed solar array could be an affordable replacement for coal power that delivers greater independence -- picture remote towns that need a fresh water supply.

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