+/**
+ * Determines a writable directory for temporary files.
+ * Function's preference is to WP_CONTENT_DIR followed by the return value of <code>sys_get_temp_dir()</code>, before finally defaulting to /tmp/
+ *
+ * In the event that this function does not find a writable location, It may be overridden by the <code>WP_TEMP_DIR</code> constant in your <code>wp-config.php</code> file.
+ *
+ * @since 2.5.0
+ *
+ * @return string Writable temporary directory
+ */
+function get_temp_dir() {
+ static $temp;
+ if ( defined('WP_TEMP_DIR') )
+ return trailingslashit(WP_TEMP_DIR);
+
+ if ( $temp )
+ return trailingslashit($temp);
+
+ $temp = WP_CONTENT_DIR . '/';
+ if ( is_dir($temp) && @is_writable($temp) )
+ return $temp;
+
+ if ( function_exists('sys_get_temp_dir') ) {
+ $temp = sys_get_temp_dir();
+ if ( @is_writable($temp) )
+ return trailingslashit($temp);
+ }
+
+ $temp = ini_get('upload_tmp_dir');
+ if ( is_dir($temp) && @is_writable($temp) )
+ return trailingslashit($temp);
+
+ $temp = '/tmp/';
+ return $temp;
+}
+