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如何把一个数组变成一串字符串

WBOY
WBOYOriginal
2016-06-13 12:41:30795browse

怎么把一个数组变成一串字符串
array(aa,bb,cc,dd)
我想把数组变成一个字符串,用逗号分割,我印象中好像有个函数的。
“aa,bb,cc,dd”

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