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PHP array splicing MySQL in statement

Usually php The back end receives the front end 1 An array parameter is usually ：

Array ：['aa','bb','cc']
json Array string ： '["aa","bb","cc"]'
Comma separated strings ：'aa,bb,cc'

First, convert it into an array ：

#json String to array 
$str = '["aa","bb","cc"]';
$arr = json_decode($s

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