Add testcases for implode() and str_repeat()

ext/standard/tests/strings/implode.phpt

@@ -0,0 +1,18 @@
+--TEST--
+implode() function
+--POST--
+--GET--
+--FILE--
+<?php
+echo implode(array())."\n";
+echo implode('nothing', array())."\n";
+echo implode(array('foo', 'bar', 'baz'))."\n";
+echo implode(':', array('foo', 'bar', 'baz'))."\n";
+echo implode(':', array('foo', array('bar', 'baz'), 'burp'))."\n";
+?>
+--EXPECT--
+
+
+foobarbaz
+foo:bar:baz
+foo:Array:burp

ext/standard/tests/strings/str_repeat.phpt

@@ -0,0 +1,29 @@
+--TEST--
+str_repeat() function
+--POST--
+--GET--
+--FILE--
+<?php
+$input = array('a', 'foo', 'barbazbax');
+foreach($input AS $i) {
+	for($n=0; $n<5; $n++) {
+		echo str_repeat($i, $n)."\n";
+	}
+}
+?>
+--EXPECT--
+
+a
+aa
+aaa
+aaaa
+
+foo
+foofoo
+foofoofoo
+foofoofoofoo
+
+barbazbax
+barbazbaxbarbazbax
+barbazbaxbarbazbaxbarbazbax
+barbazbaxbarbazbaxbarbazbaxbarbazbax