用php做模糊而又精确的查找

id | cid -- ------------------------------ 1 | , 4 , 5 , 7 , -- ------------------------------ 3 | , 4 , 5 , 8 , -- ------------------------------ 4 | , 5 , 4 , -- ------------------------------ 6 | , 5 , 4 , 7 , 8 , -- -------------------

id | cid

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1| ,4,5,7,

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3| ,4,5,8,

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4| ,5,4,

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6| ,5,4,7,8,

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7| ,8,4,5,7,9,

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8| ,7,9,4,5,8,10,