php uses array_diff to remove elements

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

grammar

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

2. array_diff() compares the values ​​of two (or more) arrays (value in key=>value) and returns a difference array; the difference array includes all the values ​​in the compared array (array1) , but a value that is not in any other parameter array (array2 or array3, etc.).

Example

 <?php
header("Content-type:text/html;charset=utf-8");

$a=array(1,2,3);

$b=array(2,3,4);

//Get an array consisting of elements that exist in $a but not in $b
$c1=array_diff($a,$b);

//Get an array consisting of elements that exist in $b but not in $a
$c2=array_diff($b,$a);

//Two arrays after removing the same elements
echo 'Two arrays after removing the same elements:'.'
';

var_dump($c1);

var_dump($c2);

?>

The above is how PHP uses array_diff to remove elements. I hope it will be helpful to everyone. More PHP learning guide: PHP array