Methods for judging array equality in PHP and introduction to array operators, array operators _php tutorial

Methods for judging array equality in PHP and introduction to array operators, array operators

How can I tell if two arrays are equal? Actually very simple, with = = or = = = can be
The PHP manual explains the following:

Can a multidimensional array such as Array (' K ' =>array ()) be judged equal by the above method? Of course I can.
If the array is a numeric index, you should pay attention to the code:
Copy the Code code as follows:
<?php
$a = Array ("Apple", "banana");
$b = Array (1 = "banana", "0" = "apple");

Var_dump ($a = = $b); BOOL (TRUE)
Var_dump ($a = = = $b); BOOL (FALSE)
?>

In addition to the array operator = =, there are other methods of comparison around to judge. For example, using Array_diff ($a, $b) to compare the difference set of two arrays, if the difference set is an empty array, then it will be equal.
And then say the array's + plus operator. + and Array_merge the difference when encountering equal key, with +, the left array will overwrite the value of the right array, Array_merge instead, the following array overrides the previous.

Copy the Code code as follows:
<?php
$a = Array ("A" = "Apple", "b" = "banana");
$b = Array ("A" = "pear", "b" = "Strawberry", "c" = "cherry");

$c = $a + $b; Union of $a and $b
echo "Union of \ $a and \ $b: \ n";
Var_dump ($c);

$c = Array_merge ($a, $b); Union of $b and $a
echo "Array_merge of \ $b and \ $a: \ n";
Var_dump ($c);
?>

Post-Execution output:

Copy the Code code as follows:
Union of $a and $b:
Array (3) {
["A"]=>
String (5) "Apple"
["B"]=>
String (6) "Banana"
["C"]=>
String (6) "Cherry"
}
Array_merge of $b and $a:
Array (3) {
["A"]=>
String (4) "Pear"
["B"]=>
String (Ten) "Strawberry"
["C"]=>
String (6) "Cherry"
}

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