Implementation examples of simple intersection, difference and union functions of PHP arrays

The example of this article describes the PHP implementation of simple intersection, difference, and union functions for arrays. Share it with everyone for your reference, the details are as follows:

 'zero',
'1' => 'one',
'2' => 'two',
'3' => 'three'
);
$arr2 = array(
'2' => 'two',
'three' => 'three',
'4' => 'four',
'5' => 'five'
);
//差集【对比返回在 arr1 中但是不在 arr2 及任何其它参数数组中的值。】
$array_diff = array_diff($arr1,$arr2); 
echo "
"; print_r($array_diff);
/* 输出结果
*Array
*(
* [0] => zero
* [1] => one
*)
*/
//交集【对比返回既在 arr1 中也在 arr2 数组中的值。】
# 注意事项: 键值保留arr1数组中的键值不变
$array_intersect = array_intersect($arr1,$arr2); 
echo "
"; print_r($array_intersect);
/* 输出结果
*Array
*(
* [2] => two
* [3] => three
*)
*/
//并集【将arr1数组中的值附加在arr2数组的后面。返回作为结果的数组。 】
#注意事项：【如果输入的数组中有相同的字符串键名，则该键名后面的值将覆盖前一个值。
#然而，如果数组包含数字键名，后面的值将不会覆盖原来的值，而是附加到后面。】
$array_merge = array_merge($arr1,$arr2); 
echo "
"; print_r($array_merge);
/* 输出结果
* Array
* (
* [0] => zero
* [1] => one
* [2] => two
* [3] => three
* [4] => two
* [three] => three
* [5] => four
* [6] => five
* )
*/
?>
 Running results: 
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