Add quotes arround command name

Author: Girgias

ext/standard/file.c

@@ -954,15 +954,15 @@ PHP_FUNCTION(popen)
 
 	fp = VCWD_POPEN(command, posix_mode);
 	if (!fp) {
-		php_error_docref(NULL, E_WARNING, "%s with command %s and POSIX mode %s", strerror(errno), command, posix_mode);
+		php_error_docref(NULL, E_WARNING, "%s with command \"%s\" and POSIX mode %s", strerror(errno), command, posix_mode);
 		efree(posix_mode);
 		RETURN_FALSE;
 	}
 
 	stream = php_stream_fopen_from_pipe(fp, mode);
 
 	if (stream == NULL)	{
-		php_error_docref(NULL, E_WARNING, "%s with command %s and mode %s", strerror(errno), command, mode);
+		php_error_docref(NULL, E_WARNING, "%s with command \"%s\" and mode %s", strerror(errno), command, mode);
 		RETVAL_FALSE;
 	} else {
 		php_stream_to_zval(stream, return_value);

ext/standard/tests/file/popen_pclose_error.phpt

@@ -40,7 +40,7 @@ NULL
 Warning: popen() expects exactly 2 parameters, 1 given in %s on line %d
 NULL
 
-Warning: popen(): Invalid argument with command abc.txt and POSIX mode rw in %s on line %d
+Warning: popen(): Invalid argument with command "abc.txt" and POSIX mode rw in %s on line %d
 bool(false)
 
 Warning: pclose() expects exactly 1 parameter, 0 given in %s on line %d