我正在使用Laravel 5.我想知道哪些变量都传递给视图内部的视图。
由于所有变量都在视图范围内，我认为我可以使用通用的PHP函数：get_defined_vars(); http://php.net/manual/en/function.get-defined-vars.php
像这样的东西：
// resources/view/home.blade.php
<html>
<body>
<?php print_r(get_defined_vars()); ?>
</body>
</html>
但我想知道是否有更好的方法（像View::getData()）
注意：get_defined_vars（）不起作用，因为它返回数百个无用的变量（Laravel组件）
这是使用print_r(get_defined_vars())的片段（部分）（我认为它进入无限递归循环）：
Array
(
[__path] => C:\net\laravel\storage\framework\views/8e030a77b0bdbacc2c4182fc04420d1d
[__data] => Array
(
[__env] => Illuminate\View\Factory Object
(
[engines:protected] => Illuminate\View\Engines\EngineResolver Object
(
[resolvers:protected] => Array
(
[php] => Closure Object
(
[this] => Illuminate\View\ViewServiceProvider Object
(
[app:protected] => Illuminate\Foundation\Application Object
(
[basePath:protected] => C:\net\laravel
[hasBeenBootstrapped:protected] => 1
[booted:protected] => 1
[bootingCallbacks:protected] => Array
(
[0] => Closure Object
(
[static] => Array
(
[instance] => Illuminate\Bus\BusServiceProvider Object
(
[defer:protected] => 1
[app:protected] => Illuminate\Foundation\Application Object
*RECURSION*
)
)
[this] => Illuminate\Foundation\Application Object
*RECURSION*
)
[1] => Closure Object
(
[static] => Array
(
[instance] => Illuminate\Translation\TranslationServiceProvider Object
(
[defer:protected] => 1
[app:protected] => Illuminate\Foundation\Application Object
*RECURSION*
)
)
[this] => Illuminate\Foundation\Application Object
*RECURSION*
)
)
[bootedCallbacks:protected] => Array
(
)
[terminatingCallbacks:protected] => Array
(
)
[serviceProviders:protected] => Array
(
[0] => Illuminate\Events\EventServiceProvider Object
(
[app:protected] => Illuminate\Foundation\Application Object
*RECURSION*
[defer:protected] =>
)
使用dd助手：
{{ dd(get_defined_vars()) }}
阅读更多：https://laravel.com/docs/5.4/helpers#method-dd
更新（thx，@ JoeCoder）：您可以通过以下方式进一步减少“无用”变量：
{{ dd(get_defined_vars()['__data']) }}
如果您正在使用Laravel 5.1，现在允许使用自定义指令扩展Blade，您可能会觉得这很有用。您需要在此example中注册AppServiceProvider中的指令或创建您自己的提供程序。
/**
* Blade directive to dump template variables. Accepts single parameter
* but also could be invoked without parameters to dump all defined variables.
* It does not stop script execution.
* @example @d
* @example @d(auth()->user())
*/
Blade::directive('d', function ($data) {
return sprintf("<?php (new Illuminate\Support\Debug\Dumper)->dump(%s); ?>",
null !== $data ? $data : "get_defined_vars()['__data']"
);
});
/**
* Blade directive to dump template variables. Accepts single parameter
* but also could be invoked without parameters to dump all defined variables.
* It works similar to dd() function and does stop script execution.
* @example @dd
* @example @dd(auth()->user())
*/
Blade::directive('dd', function ($data) {
return sprintf("<?php (new Illuminate\Support\Debug\Dumper)->dump(%s); exit; ?>",
null !== $data ? $data : "get_defined_vars()['__data']"
);
});
为了更好的可读性和调试目的，您还可以创建一个帮助器，将输出转换为数组。
// as per comment from Braunson add this to custom helpers function in app\helpers.php and include it via composer.
if (! function_exists('da')) {
/**
* Dump the passed variables to array and end the script.
*
* @param mixed
* @return void
*/
function da()
{
array_map(function ($x) {
dd($x->toArray());
}, func_get_args());
}
}
种类相同，但有点整洁：
{{dd（$ __ data）}}