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Comparison method: 1, use the "array_diff_assoc ($arr1,$arr2)" statement to compare the key names and key values of two arrays, and return a difference array; 2, use the "difference array = = []" statement to determine whether the difference array is an empty array, if it is an empty array, it means that the two arrays are equal, and vice versa.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, you can use the array difference to determine whether two arrays are equal.

If the difference between two arrays is empty, there are no different elements in the two arrays, that is, the two arrays are equal.

If the difference between two arrays is not empty, there are different elements in the two arrays, that is, the two arrays are not equal.

So how do you get the array difference? You can use the array_diff_assoc () function.

Array_diff_assoc () compares the key names and key values of two (or more) arrays and returns an array of subtractions.

Only two arrays with equal key names and key values are equal.

Implementation steps:

1. Use array_diff_assoc () to get the array difference.

As can be seen from the output, there is a difference between $arr1 and $arr2, while there is no difference between $arr2 and $arr3.

2. Determine whether the difference array is an empty array

If ($diff1== []) {echo "two arrays are equal

";} else {echo" two arrays are not equal

";}

Because the difference array of $arr1 and $arr2 is not an empty array, it is not equal

If ($diff2== []) {echo "two arrays are equal

";} else {echo" two arrays are not equal

";}

Because $arr2 and $arr3 are empty arrays, they are equal.

Extension: encapsulate the code:

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