PHP iterate by reference - weaknesses

gistfile1.txt

<?php
http://stackoverflow.com/questions/3307409/php-pass-by-reference-in-foreach

$a = array ('zero','one','two', 'three');

foreach ($a as &$v) {
    // nothing
    echo $v . PHP_EOL;
}

// unset($v);
echo '<br>';

foreach ($a as $v) {
    echo $v . PHP_EOL . ' [' . $a[3] . ']<br>';
}

// Because on the second loop, $v is still a reference to the last array item, so it's overwritten each time.
// echo $v.'-'.$a[3].PHP_EOL;
// As you can see, the last array item takes the current loop value: 'zero', 'one', 'two', and then it's just 'two'... : )