Array Operators

Examples:

The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored.

<?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);
 
$a += $b; // Union of $a += $b is $a and $b
echo "Union of \$a += \$b: \n";
var_dump($a);
?>

Comparing arrays

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)
?>

Links:

http://php.net/manual/en/language.operators.array.php

doc_php

2025-01-10 15:47:30

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