Simplify isSubDirectory check

Shaves off another 9ms per request as can be seen at https://blackfire.io/profiles/compare/dd54cef3-e58d-4a22-b8f4-c7c4b70697be/graph

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

1 files changed, 0 insertions, 26 deletions

diff --git a/lib/private/legacy/helper.php b/lib/private/legacy/helper.php
index b19e58a9e6c..0b9477dacd4 100644
--- a/lib/private/legacy/helper.php
+++ b/lib/private/legacy/helper.php
@@ -378,32 +378,6 @@ class OC_Helper {
 	}
 
 	/**
-	 * Checks if $sub is a subdirectory of $parent
-	 *
-	 * @param string $sub
-	 * @param string $parent
-	 * @return bool
-	 */
-	public static function isSubDirectory($sub, $parent) {
-		$realpathSub = realpath($sub);
-		$realpathParent = realpath($parent);
-
-		// realpath() may return false in case the directory does not exist
-		// since we can not be sure how different PHP versions may behave here
-		// we do an additional check whether realpath returned false
-		if($realpathSub === false ||  $realpathParent === false) {
-			return false;
-		}
-
-		// Check whether $sub is a subdirectory of $parent
-		if (strpos($realpathSub, $realpathParent) === 0) {
-			return true;
-		}
-
-		return false;
-	}
-
-	/**
 	 * Returns an array with all keys from input lowercased or uppercased. Numbered indices are left as is.
 	 *
 	 * @param array $input The array to work on