id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,focuses 28613,"class_exists(classname) should be class_exists(classname, false) in a few places",jcjcc,,"Five files contain calls to class_exists without the second parameter set to false. When an autoloader is registered but the class doesn't exist, a fatal exception is thrown (see #13436) unless this second parameter is set. The incorrect calls to ""class_exists"" (ie. with only one argument) are in wp-includes/pomo/{entry, translations, streams, mo}.php. One more instance in wp-includes/pluggable-deprecated.php. The changes are very simple and should look like this (here is the one instance in pluggable-deprecated.php): {{{ if ( ! class_exists( 'wp_atom_server' ) ) { }}} becomes {{{ if ( ! class_exists( 'wp_atom_server', false ) ) { }}} #13436 mentions several more instances, but I did the above changes by hand and the site loads fine now. (It would be probably to go through and look at every instance of class_exists, though.)",defect (bug),closed,normal,,Bootstrap/Load,4.0,normal,duplicate,,,