ZEND PHP 5 Certification STUDY GUIDE

52 ” Arrays
}
int(3)
Note how the the resulting array includes all of the elements of the two original arrays,
even though they have the same values; this is a result of the fact that the keys
are different—if the two arrays had common keys (either string or numeric), they
would only appear once in the end result:
$a = array (1, 2, 3);
$b = array (’a’ => 1, 2, 3);
var_dump ($a + $b);
This results in:
array(4) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
["a"]=>
int(1)
}
Comparing Arrays
Array-to-array comparison is a relatively rare occurrence, but it can be performed
using another set of operators. Like for other types, the equivalence and identity
operators can be used for this purpose:
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)
$a = array (1, 2, 3);
$b = array (1 => 2, 2 => 3, 0 => 1);
$c = array (’a’ => 1, ’b’ => 2, ’c’ => 3);
var_dump ($a == $b); // True
var_dump ($a === $b); // False
var_dump ($a == $c); // False