Add shortcut interface SeekableIterator to LimitIterator

2 files changed, 22 insertions, 2 deletions

diff --git a/ext/spl/examples/limititerator.inc b/ext/spl/examples/limititerator.inc
index c1a19fedd9..cdc71e98ce 100755
--- a/ext/spl/examples/limititerator.inc
+++ b/ext/spl/examples/limititerator.inc
@@ -21,8 +21,12 @@ class LimitIterator implements Iterator
 	{
 		$this->it->rewind();
 		$this->index = 0;
-		while($this->index < $this->offset && $this->it->hasMore()) {
-			$this->next();
+		if (is_a($this->it, 'SeekableIterator')) {
+			$this->index = $this->it->seek($this->offset);
+		} else {
+			while($this->index < $this->offset && $this->it->hasMore()) {
+				$this->next();
+			}
 		}
 	}
 	
diff --git a/ext/spl/examples/seekableiterator.inc b/ext/spl/examples/seekableiterator.inc
new file mode 100755
index 0000000000..157d2736f4
--- /dev/null
+++ b/ext/spl/examples/seekableiterator.inc
@@ -0,0 +1,16 @@
+<?php
+
+class SeekableIterator implements Iterator
+{
+	function seek($index) {
+		$this->rewind();
+		$position = 0;
+		while($position < $index && $this->it->hasMore()) {
+			$this->next();
+			$position++;
+		}
+		return $position;
+	}
+}
+
+?>
\ No newline at end of file