[Process] Make PhpExecutableFinder look for the PHP_BINARY env var

src/Symfony/Component/Process/CHANGELOG.md

@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * added the `Process::isTtySupported()` method that allows to check for TTY support
+ * made `PhpExecutableFinder` look for the `PHP_BINARY` env var when searching the php binary
 
 4.0.0
 -----

src/Symfony/Component/Process/PhpExecutableFinder.php

@@ -35,6 +35,14 @@ class PhpExecutableFinder
      */
     public function find($includeArgs = true)
     {
+        if ($php = getenv('PHP_BINARY')) {
+            if (!is_executable($php)) {
+                return false;
+            }
+
+            return $php;
+        }
+
         $args = $this->findArguments();
         $args = $includeArgs && $args ? ' '.implode(' ', $args) : '';