Challenge for ZEND PHP5 Certification - 018

[hinom 5]

Exercise 18

 

What is true regarding $a + $b where both of them are arrays?

 

A. Duplicated keys are NOT overwritten

B. $b is appended to $a

C. The + operator is overloaded

D. This produces a syntax error

[hinom 5]

Answer: A, B

 

Explanation

 

<?php
$a = array(1,2,3);
$b = array(1,2,3,4);
$rs = $a + $b;
print_r( $rs );
?>

 

<?php
$a = array(1,2,3);
$b = array('k' => 1,2,3,4);
$rs = $a + $b;
print_r( $rs );
?>

http://php.net/types.array

http://php.net/array