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php compare two arrays and remove duplicate values
- 王林Original
- 2021-06-24 14:57:302173browse
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:
<!DOCTYPE html>
<html>
<body>
<?php
$a1=array("a"=>"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);
?>
</body>
</html> Running results:
Array ( [b] => green [c] => blue )
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