PHP Array Operators - Array Operators in PHP

PHP Array Operators

• PHP array operators are used to compare arrays and to determine the relationship between them.
• They are used to compare values in arrays, check if a certain key or value exists in an array, and to merge two arrays together into one.

Operator	Name	Syntax	Operation
+	Union	$a + $b	Union of both i.e., $a and $b
==	Equality	$a == $b	Returns true if both has same key-value pair
!=	Inequality	$a != $b	Returns True if both are unequal
===	Identity	$a === $b	Returns True if both have the same key-value pair in the same order and of the same type
!==	Non-Identity	$a !== $b	Returns True if both are not identical to each other
<>	Inequality	$a <> $b	Returns True if both are unequal

Sample Code

<?php
$a = array("a" => "Bus", "b" => "Lorry");
$b = array("c" => "Train", "d" => "Plane");
var_dump($a + $b) . "<br>";
var_dump($a == $b) . "<br>";
var_dump($a != $b) . "<br>";
var_dump($a <> $b) . "<br>";
var_dump($a === $b). "<br>";
var_dump($a !== $b). "<br>";
?>

Output

array(4) { ["a"]=> string(3) "Bus" ["b"]=> string(5) "Lorry" ["c"]=> string(5) "Train" ["d"]=> string(5) "Plane" }
bool(false)
bool(true)
bool(true)
bool(false)
bool(true)