I'm studying for the Zend PHP certification.
I am not sure about the answer to this question.
Question: What is the best way to iterate and modify every element of an array using PHP 5?
a) You cannot modify an array during iteration
b)
for($i = 0; $i < count($array); $i++) { /* ... */ }c)
foreach($array as $key => &$val) { /* ... */ }d)
foreach($array as $key => $val) { /* ... */ }e)
while(list($key, $val) = each($array)) { /* ... */ }
My instinctive is (B) since there is no need to create a temporary variable, but then I realize it won't work for associative arrays.
Further searching around the Internet I found this:
Storing the invariant array count in a separate variable improves performance.
$cnt = count($array);
for ($i = 0; $i < $cnt; $i++) { }