ZEND PHP 5 Certification STUDY GUIDE

Arrays ” 55
$a = array (’a’, ’b’, ’c’);
var_dump (array_flip ($a));
This outputs:
array(3) {
["a"]=>
int(0)
["b"]=>
int(1)
["c"]=>
int(2)
}
On the other hand, array_reverse() actually inverts the order of the array’s elements,
so that the last one appears first:
$a = array (’x’ => ’a’, 10 => ’b’, ’c’);
var_dump (array_reverse ($a));
Note how key association is only lost for those elements whose keys are numeric:
array(3) {
[0]=>
string(1) "c"
[1]=>
string(1) "b"
["x"]=>
string(1) "a"
}
Licensed to 482634 - Amber Barrow (itsadmin@deakin.edu.au)
Array Iteration
Iteration is probably one of the most common operations you will perform with arrays—besides
creating them, of course. Unlike what happens in other languages,
where arrays are all enumerative and contiguous, PHP’s arrays require a set of functionality
that matches their flexibility, because “normal” looping structures cannot