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Alex Rivera
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I have 2 arrays, the value will be loaded from database, below is an example: $arr1 = array(1,2,3); $arr2 = array(1,2,3,4,5,6,7); What I want to do is to check if all the values in $arr1 exist in $arr2 . The above example should be a TRUE while: $arr3 = array(1,2,4,5,6,7); comparing $arr1 with $arr3 will return a FALSE . Normally I use in_array because I only need to check single value into an array. But in this case, in_array cannot be used. I'd like to see if there is a simple way to do the checking with a minimum looping. UPDATE for clarification. First array will be a set that contains unique values. Second array can contain duplicated values. They are both guaranteed an array before processing.
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