Constraint memory used in TAR export

adminer/include/tmpfile.inc.php

@@ -0,0 +1,21 @@
+<?php
+
+class TmpFile {
+	var $handler;
+	var $size;
+	
+	function TmpFile() {
+		$this->handler = tmpfile();
+	}
+	
+	function write($contents) {
+		$this->size += strlen($contents);
+		fwrite($this->handler, $contents);
+	}
+	
+	function send() {
+		fseek($this->handler, 0);
+		fpassthru($this->handler);
+		fclose($this->handler);
+	}
+}