How to remove identical elements from two arrays in php

PHP method to remove the same elements in two arrays: first nest two foreach loops to traverse the two arrays; then use the if statement in the loop body to find the same elements in the two arrays; finally use The unset() function can remove the same elements from the two arrays.

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

PHP deletes the same in two arrays Elements of

<?php
	$a = [18,19,20,21,22];
	$b = [18,19,1];
	
	foreach ($a as $key=>$v1) {
		foreach($b as $key2=>$v2){
			if($v1==$v2){
			unset($a[$key]);//删除$a数组同值元素
			unset($b[$key2]);//删除$b数组同值元素
			}
		}
	}
	var_dump($a);	
	var_dump($b);
?>

Output:

## Related introduction:

unset() function

unset() function is used to destroy the given variable. The syntax is as follows:

void unset ( mixed $var [, mixed $... ] )

Parameter description:

• $var: variable to be destroyed.

PHP foreach loop

PHP foreach loop structure is a commonly used method when traversing arrays. foreach can only be applied to arrays and objects. If you try Applications to variables of other data types or uninitialized variables will issue an error message.

foreach has the following two syntax formats:

//格式1
foreach (array_expression as $value){
    statement
}
//格式2
foreach (array_expression as $key => $value){
    statement
}

When the first format traverses the array_expression array, each loop assigns the value of the array to $value; the second traversal not only assigns the array value Assign to $value and assign the key name to $key.

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