run code inspection check. fix some errors

Author: inhere

src/Signal.php

@@ -15,43 +15,43 @@
  */
 class Signal
 {
-    const IGN = 1;
-    const DFL = 0;
-    const ERR = -1;
+    public const IGN = 1;
+    public const DFL = 0;
+    public const ERR = -1;
 
-    const HUP    = 1;
-    const INT    = 2; // Ctrl+C
-    const QUIT   = 3;
-    const ILL    = 4;
-    const TRAP   = 5;
-    const ABRT   = 6;
-    const IOT    = 6;
-    const BUS    = 7;
-    const FPE    = 8;
-    const KILL   = 9;
-    const USR1   = 10;
-    const SEGV   = 11;
-    const USR2   = 12;
-    const PIPE   = 13;
-    const ALRM   = 14;
-    const TERM   = 15;
-    const STKFLT = 16;
-    const CLD    = 17;
-    const CHLD   = 17;
-    const CONT   = 18;
-    const STOP   = 19;
-    const TSTP   = 20;
-    const TTIN   = 21;
-    const TTOU   = 22;
-    const URG    = 23;
-    const XCPU   = 24;
-    const XFSZ   = 25;
-    const VTALRM = 26;
-    const PROF   = 27;
-    const WINCH  = 28;
-    const POLL   = 29;
-    const IO     = 29;
-    const PWR    = 30;
-    const SYS    = 31;
-    const BABY   = 31;
+    public const HUP    = 1;
+    public const INT    = 2; // Ctrl+C
+    public const QUIT   = 3;
+    public const ILL    = 4;
+    public const TRAP   = 5;
+    public const ABRT   = 6;
+    public const IOT    = 6;
+    public const BUS    = 7;
+    public const FPE    = 8;
+    public const KILL   = 9;
+    public const USR1   = 10;
+    public const SEGV   = 11;
+    public const USR2   = 12;
+    public const PIPE   = 13;
+    public const ALRM   = 14;
+    public const TERM   = 15;
+    public const STKFLT = 16;
+    public const CLD    = 17;
+    public const CHLD   = 17;
+    public const CONT   = 18;
+    public const STOP   = 19;
+    public const TSTP   = 20;
+    public const TTIN   = 21;
+    public const TTOU   = 22;
+    public const URG    = 23;
+    public const XCPU   = 24;
+    public const XFSZ   = 25;
+    public const VTALRM = 26;
+    public const PROF   = 27;
+    public const WINCH  = 28;
+    public const POLL   = 29;
+    public const IO     = 29;
+    public const PWR    = 30;
+    public const SYS    = 31;
+    public const BABY   = 31;
 }

src/Sys.php

@@ -103,7 +103,7 @@ public static function execute($command, bool $returnStatus = true, string $cwd
             \chdir($cwd);
         }
 
-        //system
+        // system
         if (\function_exists('system')) {
             \ob_start();
             \system($command, $exitStatus);
@@ -117,20 +117,16 @@ public static function execute($command, bool $returnStatus = true, string $cwd
             $output = \ob_get_contents();
             \ob_end_clean();
             //exec
+        } elseif (\function_exists('exec')) {
+            \exec($command, $output, $exitStatus);
+            $output = \implode("\n", $output);
+
+            //shell_exec
+        } elseif (\function_exists('shell_exec')) {
+            $output = \shell_exec($command);
         } else {
-            if (\function_exists('exec')) {
-                \exec($command, $output, $exitStatus);
-                $output = \implode("\n", $output);
-
-                //shell_exec
-            } else {
-                if (\function_exists('shell_exec')) {
-                    $output = \shell_exec($command);
-                } else {
-                    $output = 'Command execution not possible on this system';
-                    $exitStatus = 0;
-                }
-            }
+            $output = 'Command execution not possible on this system';
+            $exitStatus = 0;
         }
 
         if ($returnStatus) {