From daf84bea33ba18afad7d69e1a02ee898f1408e2c Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Fri, 14 Oct 2016 13:38:54 +0200
Subject: [PATCH] Enhance solver perf by removing count()

---
 src/Composer/DependencyResolver/Solver.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Composer/DependencyResolver/Solver.php b/src/Composer/DependencyResolver/Solver.php
index 934d22f0c..03bc138f2 100644
--- a/src/Composer/DependencyResolver/Solver.php
+++ b/src/Composer/DependencyResolver/Solver.php
@@ -758,8 +758,10 @@ class Solver
                 $systemLevel = $level;
             }
 
-            for ($i = 0, $n = 0; $n < count($this->rules); $i++, $n++) {
-                if ($i == count($this->rules)) {
+            $rulesCount = count($this->rules);
+
+            for ($i = 0, $n = 0; $n < $rulesCount; $i++, $n++) {
+                if ($i == $rulesCount) {
                     $i = 0;
                 }
 
@@ -805,6 +807,7 @@ class Solver
                 }
 
                 // something changed, so look at all rules again
+                $rulesCount = count($this->rules);
                 $n = -1;
             }