Description:
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GtkMozEmbed::render_data[1] and GtkMozEmbed::append_data[2] receive a data parameter and a int one with the length of that data, just as their C versions [3],[4]. However, this is unneeded, confusing and potentially incoherent for PHP, whose strings are binary-safe.

So an override should be added for them to get the length from the string.

1-http://gtk.php.net/manual/en/mozembed.gtkmozembed.method.render_data.php
2-http://gtk.php.net/manual/en/gtk.gtkmozembed.method.append_data.php
3-http://www.mozilla.org/unix/gtk-embedding.html#gtk_moz_embed_render_data
4-http://www.mozilla.org/unix/gtk-embedding.html#gtk_moz_embed_append_data