Similarities and differences between two ways to merge two arrays in PHP_PHP Tutorial

Especially the + operator, which means to append the right array unit (to remove duplicates) to the left array.

Copy code The code is as follows:

echo "rnFirst case rn";
$a=array(1,2,3,4,5,6);
$b=array(7,8,9);
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
echo "rnSecond case rn";
$a=array('a','b','c','d','e','f');
$b =array('a','x','y');
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b ;
print_r($c);
$c=$b+$a;
print_r($c);
echo "rnThird case rn";
$a=array (
1=>'a',
2=>'b',
3=>'c',
4=>'d',
5= >'e',
6=>'f');
$b=array(
1=>'a',
7=>'x',
8=>'y');
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r( $c);
$c=$b+$a;
print_r($c);
?>

The result is as follows:

Copy code The code is as follows:

The first case
Array
(
[0] => 1
[ 1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
[ 6] => 7
[7] => 8
[8] => 9
)
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
Array
(
[0] => 7
[1] => 8
[2] => 9
[3] => 4
[4] => 5
[5] => 6
)
The second case
Array
(
[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => f
[6] => a
[7] => x
[8] => y
)
Array
(
[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => f
)
Array
(
[0] => a
[1] => x
[2] => y
[3] = > d
[4] => e
[5] => f
)
The third case
Array
(
[0] => ; a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => ; f
[6] => a
[7] => => a
[2] => b
[3] => c
[4] => d
[5] => e
[6] => f
[7] => 7] => x
[8] => y
[2] => 5] => e
[6] => f
)





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Especially the + operator, which means to append the right array unit (to remove duplicates) to the left array behind. Copy the code. The code is as follows: ?php echo "rnFirst case rn"; $a=a...