php compare two arrays and remove duplicate values

The way PHP compares two arrays and deletes duplicate values is to use the array_diff function and take the two arrays that need to be compared as parameters, such as [array_diff(array1,array2,array3);].

The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.

If we want to compare two arrays and delete duplicate values in the two arrays, the easiest way is to use the array_diff function.

There may be many friends who are not familiar with the array_diff function. Let’s briefly introduce this function.

array_diff() function is used to compare the values of two (or more) arrays and return the difference.

This function compares the values of two (or more) arrays (key=>value in value), and returns a difference array, which includes all the arrays being compared (array1 ), but not in any other parameter array (array2 or array3, etc.).

Grammar:

array_diff(array1,array2,array3...);

Code example:

   "red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"black","g"=>"purple"); $a3=array("a"=>"red","b"=>"black","h"=>"yellow"); $result=array_diff($a1,$a2,$a3); print_r($result); ?>  

Running results:

Array ( [b] => green [c] => blue )

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