w3resource

PHP: Array Operators

Description

This is a Comprehensive PHP array operators tutorial from w3resource.com

List of array operators

Name Example Result
Union $x + $y Union of $x and $y. The + operator appends elements of remaining keys from the right-sided array to the left-handed, but duplicated keys are not overwritten.
Equality $x == $y TRUE if $x and $y have the same key/value pairs.
Identity $x === $y TRUE if $x and $y have the same key/value pairs in the same order and of the same types.
Inequality $x != $y TRUE if $x is not equal to $y.
Inequality $x <> $y TRUE if $x is not equal to $y.
Non-identity $x !== $y TRUE if $x is not identical to $y.

Example : array union (+) operator

In the following example, the union operator adds the last element from the $b array ($c = $a + $b) with $a array as "c=>" key is not present in $a array. In the second statement ($c = $b + $a) no element is added from $b as all the keys of $a array are present in $b array.

<?php 
$a = array("a" => "apple", "b" => "banana");
$b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");
$c = $a + $b; // Union of $a and $b
echo "Union of \$a and \$b : <br />";
var_dump($c);
$c = $b + $a; // Union of $b and $a 
echo "<br />Union of \$b and \$a : <br />";
var_dump($c);
?>

Output:

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"  } 

View the example in the browser

Example : array equality (==) and identity(===) operators

In the following example equality operator returns true as the two arrays have same key/value pairs whereas identity operator returns false as the key/value of the comparing arrays are same but not in same order.

<?php
$a = array("1" => "apple", "0" => "banana");
$b = array( "banana", "apple");
var_dump($a == $b);
var_dump($a === $b);
?>

Output:

bool(true)  bool(false) 

View the example in the browser

Previous: String Operators
Next: Incrementing Decrementing Operators



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://w3resource.com/php/operators/array-operators.php