diff --git a/src/Composer/DependencyResolver/Problem.php b/src/Composer/DependencyResolver/Problem.php
index 0dcc938fd..bb497b549 100644
--- a/src/Composer/DependencyResolver/Problem.php
+++ b/src/Composer/DependencyResolver/Problem.php
@@ -81,8 +81,11 @@ class Problem
 
             $job = $reason['job'];
 
-            if (isset($job['constraint'])) {
-                $packages = $this->pool->whatProvides($job['packageName'], $job['constraint']);
+            $packageName = $job['packageName'];
+            $constraint = $job['constraint'];
+
+            if (isset($constraint)) {
+                $packages = $this->pool->whatProvides($packageName, $constraint);
             } else {
                 $packages = array();
             }
@@ -90,9 +93,9 @@ class Problem
             if ($job && $job['cmd'] === 'install' && empty($packages)) {
 
                 // handle php/hhvm
-                if ($job['packageName'] === 'php' || $job['packageName'] === 'php-64bit' || $job['packageName'] === 'hhvm') {
+                if ($packageName === 'php' || $packageName === 'php-64bit' || $packageName === 'hhvm') {
                     $version = phpversion();
-                    $available = $this->pool->whatProvides($job['packageName']);
+                    $available = $this->pool->whatProvides($packageName);
 
                     if (count($available)) {
                         $firstAvailable = reset($available);
@@ -103,13 +106,13 @@ class Problem
                         }
                     }
 
-                    $msg = "\n    - This package requires ".$job['packageName'].$this->constraintToText($job['constraint']).' but ';
+                    $msg = "\n    - This package requires ".$packageName.$this->constraintToText($constraint).' but ';
 
                     if (defined('HHVM_VERSION') || count($available)) {
                         return $msg . 'your HHVM version does not satisfy that requirement.';
                     }
 
-                    if ($job['packageName'] === 'hhvm') {
+                    if ($packageName === 'hhvm') {
                         return $msg . 'you are running this with PHP and not HHVM.';
                     }
 
@@ -117,43 +120,43 @@ class Problem
                 }
 
                 // handle php extensions
-                if (0 === stripos($job['packageName'], 'ext-')) {
-                    if (false !== strpos($job['packageName'], ' ')) {
-                        return "\n    - The requested PHP extension ".$job['packageName'].' should be required as '.str_replace(' ', '-', $job['packageName']).'.';
+                if (0 === stripos($packageName, 'ext-')) {
+                    if (false !== strpos($packageName, ' ')) {
+                        return "\n    - The requested PHP extension ".$packageName.' should be required as '.str_replace(' ', '-', $packageName).'.';
                     }
 
-                    $ext = substr($job['packageName'], 4);
+                    $ext = substr($packageName, 4);
                     $error = extension_loaded($ext) ? 'has the wrong version ('.(phpversion($ext) ?: '0').') installed' : 'is missing from your system';
 
-                    return "\n    - The requested PHP extension ".$job['packageName'].$this->constraintToText($job['constraint']).' '.$error.'. Install or enable PHP\'s '.$ext.' extension.';
+                    return "\n    - The requested PHP extension ".$packageName.$this->constraintToText($constraint).' '.$error.'. Install or enable PHP\'s '.$ext.' extension.';
                 }
 
                 // handle linked libs
-                if (0 === stripos($job['packageName'], 'lib-')) {
-                    if (strtolower($job['packageName']) === 'lib-icu') {
+                if (0 === stripos($packageName, 'lib-')) {
+                    if (strtolower($packageName) === 'lib-icu') {
                         $error = extension_loaded('intl') ? 'has the wrong version installed, try upgrading the intl extension.' : 'is missing from your system, make sure the intl extension is loaded.';
 
-                        return "\n    - The requested linked library ".$job['packageName'].$this->constraintToText($job['constraint']).' '.$error;
+                        return "\n    - The requested linked library ".$packageName.$this->constraintToText($constraint).' '.$error;
                     }
 
-                    return "\n    - The requested linked library ".$job['packageName'].$this->constraintToText($job['constraint']).' has the wrong version installed or is missing from your system, make sure to load the extension providing it.';
+                    return "\n    - The requested linked library ".$packageName.$this->constraintToText($constraint).' has the wrong version installed or is missing from your system, make sure to load the extension providing it.';
                 }
 
-                if (!preg_match('{^[A-Za-z0-9_./-]+$}', $job['packageName'])) {
-                    $illegalChars = preg_replace('{[A-Za-z0-9_./-]+}', '', $job['packageName']);
+                if (!preg_match('{^[A-Za-z0-9_./-]+$}', $packageName)) {
+                    $illegalChars = preg_replace('{[A-Za-z0-9_./-]+}', '', $packageName);
 
-                    return "\n    - The requested package ".$job['packageName'].' could not be found, it looks like its name is invalid, "'.$illegalChars.'" is not allowed in package names.';
+                    return "\n    - The requested package ".$packageName.' could not be found, it looks like its name is invalid, "'.$illegalChars.'" is not allowed in package names.';
                 }
 
-                if ($providers = $this->pool->whatProvides($job['packageName'], $job['constraint'], true, true)) {
-                    return "\n    - The requested package ".$job['packageName'].$this->constraintToText($job['constraint']).' is satisfiable by '.$this->getPackageList($providers).' but these conflict with your requirements or minimum-stability.';
+                if ($providers = $this->pool->whatProvides($packageName, $constraint, true, true)) {
+                    return "\n    - The requested package ".$packageName.$this->constraintToText($constraint).' is satisfiable by '.$this->getPackageList($providers).' but these conflict with your requirements or minimum-stability.';
                 }
 
-                if ($providers = $this->pool->whatProvides($job['packageName'], null, true, true)) {
-                    return "\n    - The requested package ".$job['packageName'].$this->constraintToText($job['constraint']).' exists as '.$this->getPackageList($providers).' but these are rejected by your constraint.';
+                if ($providers = $this->pool->whatProvides($packageName, null, true, true)) {
+                    return "\n    - The requested package ".$packageName.$this->constraintToText($constraint).' exists as '.$this->getPackageList($providers).' but these are rejected by your constraint.';
                 }
 
-                return "\n    - The requested package ".$job['packageName'].' could not be found in any version, there may be a typo in the package name.';
+                return "\n    - The requested package ".$packageName.' could not be found in any version, there may be a typo in the package name.';
             }
         }
 
@@ -202,27 +205,29 @@ class Problem
      */
     protected function jobToText($job)
     {
+        $packageName = $job['packageName'];
+        $constraint = $job['constraint'];
         switch ($job['cmd']) {
             case 'install':
-                $packages = $this->pool->whatProvides($job['packageName'], $job['constraint']);
+                $packages = $this->pool->whatProvides($packageName, $constraint);
                 if (!$packages) {
-                    return 'No package found to satisfy install request for '.$job['packageName'].$this->constraintToText($job['constraint']);
+                    return 'No package found to satisfy install request for '.$packageName.$this->constraintToText($constraint);
                 }
 
-                return 'Installation request for '.$job['packageName'].$this->constraintToText($job['constraint']).' -> satisfiable by '.$this->getPackageList($packages).'.';
+                return 'Installation request for '.$packageName.$this->constraintToText($constraint).' -> satisfiable by '.$this->getPackageList($packages).'.';
             case 'update':
-                return 'Update request for '.$job['packageName'].$this->constraintToText($job['constraint']).'.';
+                return 'Update request for '.$packageName.$this->constraintToText($constraint).'.';
             case 'remove':
-                return 'Removal request for '.$job['packageName'].$this->constraintToText($job['constraint']).'';
+                return 'Removal request for '.$packageName.$this->constraintToText($constraint).'';
         }
 
-        if (isset($job['constraint'])) {
-            $packages = $this->pool->whatProvides($job['packageName'], $job['constraint']);
+        if (isset($constraint)) {
+            $packages = $this->pool->whatProvides($packageName, $constraint);
         } else {
             $packages = array();
         }
 
-        return 'Job(cmd='.$job['cmd'].', target='.$job['packageName'].', packages=['.$this->getPackageList($packages).'])';
+        return 'Job(cmd='.$job['cmd'].', target='.$packageName.', packages=['.$this->getPackageList($packages).'])';
     }
 
     protected function getPackageList($packages)