===KEY===
<?php
-foreach(new RegexIterator(new ArrayIterator($ar), "/2/", RegexIterator::USE_KEY) as $k => $v)
+foreach(new RegexIterator(new ArrayIterator($ar), "/2/", 0, RegexIterator::USE_KEY) as $k => $v)
{
echo "$k=>$v\n";
}
Error: Argument 3 passed to iterator_apply() must be an array, integer given
Error: iterator_apply() expects parameter 3 to be array, integer given
NULL
-Error: iterator_apply() expects parameter 2 to be function,%sstring given
+Error: iterator_apply() expects parameter 2 to be valid callback,%sstring given
NULL
Error: iterator_apply() expects at most 3 parameters, 4 given
NULL