Issue #2162437 by gnassar, ehowland: PHP 5.4 strict warning: Only variables should be passed by reference

Issue #1597970 by drupalishsandip and soxofaan: PHP sucks at comparing strings that look like numbers

Seriously: string comparison ("123" == "0123.") is true in PHP

GD library availability check should look for imagepng function (which is required), not imagejpeg (which is optional). Related to issue #1337366.

rocnhorse authored Nov 02, 2011 and soxofaan committed Nov 02, 2011

Issue #1024370: Make sure we can use a top level form value $form_state['values']['captcha_response'], even if the form has #tree=true.

properly sort result of ctools_export_load_object for on settings page. (follow up of of issue #825088)

Issue #976436 by matheusgorino, soxofaan: Adds an ob_end_clean to prevent the output image from being corrupted.

#881156 by elachlan and soxofaan: disable autocomplete on CAPTCHA response field with javascript (instead of with non-standard markup)

#995748 by soxofaan: fixed problem of CAPTCHA reuse attack detection when using multiple CAPTCHA protected forms on same page (with test)

#825088 by Nedjo and Soxofaan (first part): renamed 'type' column in 'captcha_point' table to 'captcha_type' to make it exportable