Clean up the php process command builder

* Gets rid of the need for eval-stdin.php in phpdbg with the s option
* Only include the args separator when a file is not given

src/Util/PHP/AbstractPhpProcess.php

@@ -180,24 +180,21 @@ public function getCommand(array $settings, string $file = null): string
         $command .= $this->settingsToParameters($settings);
 
         if (\PHP_SAPI === 'phpdbg') {
-            $command .= ' -qrr ';
+            $command .= ' -qrr';
 
-            if ($file) {
-                $command .= '-e ' . \escapeshellarg($file);
-            } else {
-                $command .= \escapeshellarg(__DIR__ . '/eval-stdin.php');
-            }
-        } else {
-            if ($file) {
-                $command .= ' -f ' . \escapeshellarg($file);
+            if (!$file) {
+                $command .= 's=';
             }
+        }
 
-            if ($this->args) {
-                $command .= ' --';
-            }
+        if ($file) {
+            $command .= ' ' . \escapeshellarg($file);
         }
 
         if ($this->args) {
+            if (!$file) {
+                $command .= ' --';
+            }
             $command .= ' ' . $this->args;
         }
 

tests/Util/PHP/AbstractPhpProcessTest.php

@@ -83,8 +83,7 @@ public function testShouldUseArgsToCreateCommand(): void
 
     public function testShouldHaveFileToCreateCommand(): void
     {
-        $argumentEscapingCharacter = \DIRECTORY_SEPARATOR === '\\' ? '"' : '\'';
-        $expectedCommandFormat     = \sprintf('%%s -%%c %1$sfile.php%1$s', $argumentEscapingCharacter);
+        $expectedCommandFormat     = '%s %cfile.php%c';
         $actualCommand             = $this->phpProcess->getCommand([], 'file.php');
 
         $this->assertStringMatchesFormat($expectedCommandFormat, $actualCommand);