Data commit

Task/Hash-join/PHP/hash-join.php

@@ -0,0 +1,27 @@
+<?php
+function hashJoin($table1, $index1, $table2, $index2) {
+    // hash phase
+    foreach ($table1 as $s)
+        $h[$s[$index1]][] = $s;
+    // join phase
+    foreach ($table2 as $r)
+    	foreach ($h[$r[$index2]] as $s)
+	    $result[] = array($s, $r);
+    return $result;
+}
+
+$table1 = array(array(27, "Jonah"),
+           array(18, "Alan"),
+           array(28, "Glory"),
+           array(18, "Popeye"),
+           array(28, "Alan"));
+$table2 = array(array("Jonah", "Whales"),
+           array("Jonah", "Spiders"),
+           array("Alan", "Ghosts"),
+           array("Alan", "Zombies"),
+           array("Glory", "Buffy"),
+           array("Bob", "foo"));
+
+foreach (hashJoin($table1, 1, $table2, 0) as $row)
+    print_r($row);
+?>