Re: Extension for str_replace / preg_replace with arrays

On 12/19/2012 03:18 PM, Larry Garfield wrote:

You could likely simplify the code even further using an infinite iterator: http://us1.php.net/infiniteiterator $result = preg_replace_callback(

     '/word/',
     function($matches) use (&$replacements_iterator) {
         return $replacements->next();
     },
     'word word word word word'

); --Larry Garfield

What am I missing that causes the first call to $replacements_iterator->current() to return NULL unless the iterator is rewound before use? Chris ------------------ <?php $replacements = array(

    'one', 'two', 'three'

); $replacements_iterator = new InfiniteIterator(new ArrayIterator($replacements)); $replacements_iterator->rewind(); // why is the rewind needed? $result = preg_replace_callback(

    '/word/',
    function($matches) use ($replacements_iterator) {
        $r = $replacements_iterator->current();
        $replacements_iterator->next();
        return $r;
    },
    'word word word word word'

); var_dump($result); // Outputs:

//    string(21) "one two three one two"

// Without the call to $replacements_iterator->rewind(), the output is:

//    string(18) " two three one two"

?> -- christopher.jones@oracle.com http://twitter.com/ghrd