added a test for the presence of git

Added a function to detect if a command exists, then we can test if the
command 'git' exists (if yes, it means Git is installed on the computer)

Author: MsieurPafi

phpwpinfo.php

@@ -38,6 +38,31 @@ function phpwpinfo() {
 	$info->init_all_tests();
 }
 
+function command_exists ($command) {
+	  $whereIsCommand = (PHP_OS == 'WINNT') ? 'where' : 'which';
+
+	  $process = proc_open(
+	    "$whereIsCommand $command",
+	    array(
+	      0 => array("pipe", "r"), //STDIN
+	      1 => array("pipe", "w"), //STDOUT
+	      2 => array("pipe", "w"), //STDERR
+	    ),
+	    $pipes
+	  );
+	  if ($process !== false) {
+	    $stdout = stream_get_contents($pipes[1]);
+	    $stderr = stream_get_contents($pipes[2]);
+	    fclose($pipes[1]);
+	    fclose($pipes[2]);
+	    proc_close($process);
+
+	    return $stdout != '';
+	  }
+
+	  return false;
+	}
+
 /**
  * TODO: Use or not session for save DB configuration
  */
@@ -92,10 +117,10 @@ public function init_all_tests() {
 		$this->test_form_mail();
 
 		$this->get_footer();
-	}
+	}	
 
 	/**
-	 * Main test, check if php/mysql are installed and right version for WP
+	 * Main test, check if php/mysql/git are installed and right version for WP
 	 */
 	public function test_versions() {
 		$this->html_table_open( 'General informations & tests PHP/MySQL Version', '', 'Required', 'Recommended', 'Current' );
@@ -142,6 +167,13 @@ public function test_versions() {
 			$this->html_table_row( 'MySQL Version', $this->mysqli_version, '-', 'Not available, needs credentials.', 'warning' );
 		}
 
+		//Test if the command 'git' exists, so it tests if Git is installed
+		if(command_exists('git') == 1){
+			$this->html_table_row('Presence of Git', 'No', 'Yes', 'Yes');
+		}else{
+			$this->html_table_row('Presence of Git', 'No', 'Yes', 'No', 'error');
+		}
+
 		$this->html_table_close();
 	}