Isset 检查 Array - Blade Laravel 5.8

Question

如果我这样做

{{ dd($alert) }}

我得到了

array:7 [▼
  "created_at" => "2019-12-30 17:31:55.728307+00:00"
  "fail_cnt" => 123
  "updated_at" => "2019-12-30 17:31:55.728307+00:00"
]

提示：它是一个数组，不是一个对象。

我正在尝试对数组使用 isset 检查

<input required type="number" name="slaac" class="form-control form-control-sm"  placeholder="1000" value="{{ $alert['slaac_threshold'] or '' }}">

我一直在

我做错了什么？

Answer 1

只需使用空合并运算符 ?? 即可：

{{ $alert['slaac_threshold'] ?? '' }}

Blade 中的 OR 运算符已在 Laravel 5.7 中删除，并且从未完全正常工作。

"The Blade "or" operator has been removed in favor of PHP's built-in ?? "null coalesce" operator, which has the same purpose and functionality" - Laravel 5.7 Docs - Upgrade Guide - Blade

PHP.net Manual - 7.0 New Features - Null Coalesce

Isset 检查 Array - Blade Laravel 5.8

Isset check on Array - Blade Laravel 5.8

php

laravel

laravel-5

laravel-blade

laravel-5.8