<?php namespace Illuminate\View\Compilers\Concerns; trait CompilesClasses { /** * Compile the conditional class statement into valid PHP. * * @param string $expression * @return string */ protected function compileClass($expression) { $expression = is_null($expression) ? '([])' : $expression; return "class=\"<?php echo \Illuminate\Support\Arr::toCssClasses{$expression} ?>\""; } }