How php compares two arrays to see if they are different

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Comparison method: 1, use "array_diff (array 1, array 2)", only compare array values; 2, use "array_diff_assoc (array 1, array 2)", key and value are compared. After comparing the array, both methods return a difference array; if the difference array is an empty array, the two arrays are the same, and vice versa.

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

Php compares whether the two arrays are different.

In PHP, you can use the array_diff () or array_diff_assoc () function to compare two arrays to see if they are different.

The array_diff () or array_diff_assoc () function returns a difference array after comparing the array; if the difference array is empty, the two arrays are the same, and vice versa.

Let's take a look at the details:

Method 1: use array_diff () to compare whether the two arrays are different

The array_diff () function compares the values of two arrays and returns the difference. Syntax format:

Array_diff (array1,array2)

Return value:

Returns a subtraction array that contains all values in the array being compared (array1), but not in any other parameter array (array2, etc.).

Example:

Method 2: use the array_diff_assoc () function

The array_diff_assoc () function compares the key names and key values of two (or more) arrays and returns the difference. Syntax format:

Array_diff_assoc (array1,array2)

This function compares the key names and key values of two (or more) arrays and returns a subtraction array that includes all key names and key values in the compared array (array1) but not in any other parameter array (array2).

Example:

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