Operátory poľa v PHP
Example
| Name
| Result
|
$a + $b
| Union
| Union of $a and $b.
|
$a == $b
| Equality
| TRUE if $a and $b have the same key/value pairs.
|
$a === $b
| Identity
| TRUE if $a and $b have the same key/value pairs in the same order and of the same types.
|
$a != $b
| Inequality
| TRUE if $a is not equal to $b.
|
$a <> $b
| Inequality
| TRUE if $a is not equal to $b.
|
$a !== $b
| Non-identity
| TRUE if $a is not identical to $b.
|
The + operator appends the right handed array to the left handed, whereas duplicated keys are NOT overwritten.
<?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 =
$b +
$a;
// Union of $b and $a
echo "Union of \$b and \$a: \n";
var_dump
($c);
?>
When executed, this script will print the following:
Union of
$a and $b:
array
(3
) {
[
"a"]=>
string
(5
) "apple"
[
"b"]=>
string
(6
) "banana"
[
"c"]=>
string
(6
) "cherry"
}
Union of
$b and $a:
array
(3
) {
[
"a"]=>
string
(4
) "pear"
[
"b"]=>
string
(10
) "strawberry"
[
"c"]=>
string
(6
) "cherry"
}
Elements of arrays are equal for the comparison if they have the same key and value.
<?php
$a = array("apple", "banana");
$b = array(1 => "banana", "0" => "apple");
var_dump($a == $b); // bool(true)
var_dump($a === $b); // bool(false)
?>