View file vendor/laravel/framework/src/Illuminate/View/Compilers/Concerns/CompilesStyles.php
<?php namespace Illuminate\View\Compilers\Concerns; trait CompilesStyles { /** * Compile the conditional style statement into valid PHP. * * @param string $expression * @return string */ protected function compileStyle($expression) { $expression = is_null($expression) ? '([])' : $expression; return "style=\"<?php echo \Illuminate\Support\Arr::toCssStyles{$expression} ?>\""; } }