Comparison of array_diff_assoc and array_diff function instances in PHP

I mentioned array_diff before, this time it is its upgraded version, the PHP array difference comparison array_diff_assoc function is used to compare the differences between keys and values ​​in different arrays and output them according to the index array.

The usage syntax is the same as array_diff

$newarray = array_diff_assoc($array1,$array2....);

The same thing to note: array_diff_assoc cannot be compared recursively , can only be a one-dimensional array. If the array is nested within an array, the subsequent arrays will be compared according to "array", even if they are different arrays, they will be the same.

The difference is that this time there are more key values, that is, index values. If the indexes are different, they must be returned to the array.

Example:

1. Comparison with index

"array","key_function"=>"array_diff_assoc");
$array1 = array("site"=>"forasp","name"=>"网站制作学习网","key_function"=>"array_diff_assoc");
$forasp = array_diff_assoc($array,$array1);
print_r($forasp);
?>

Result:

Array
(
[key_name] => array //也就是这个key-value 值没有在后面的数组中出现，是个不同值。
)

2. What if it is an array without index

The result is the same as above, the difference is that this key becomes an index

Array
(
[1] => array //也就是这个key-value 值没有在后面的数组中出现，是个不同值。
)

That is to say, in an array without an index, the index id and value are compared.

array_diff_assoc has been introduced. It is an upgraded version of array_diff.

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