树枝:按键"0"不存在，因为数组为空，但转储显示数组 [英] Twig: Key "0" does not exist as the array is empty but dump show array

问题描述

我在Twig尝试显示数组时遇到问题.

I have a problem in Twig trying to show an array.

当我转储变量 {{dump(perfilServidor)}} 时，我得到:

When I dump the variable {{ dump(perfilServidor) }}, I get:

array:3 [▼
  0 => UypPerfilServidor {#6122 ▼
    -id: 1
    -idPerfil: 8
    -uypPerfil: UypPerfil {#363 ▶}
    -uypServidor: UypServidor {#6118 ▶}
  }
  1 => UypPerfilServidor {#6117 ▼
    -id: 2
    -idPerfil: 8
    -uypPerfil: UypPerfil {#363}
    -uypServidor: UypServidor {#6116 ▶}
  }
  2 => UypPerfilServidor {#6114 ▼
    -id: 3
    -idPerfil: 8
    -uypPerfil: UypPerfil {#363}
    -uypServidor: UypServidor {#6115 ▶}
  }
]

但是当我尝试转储数组 {{dump(perfilServidor [0])}} 的一个键时，它将引发异常:

But when I try to dump one key of the array {{ dump(perfilServidor[0]) }}, it throws an Exception:

键"0"不存在，因为数组为空

Key "0" does not exist as the array is empty

如果我尝试访问另一个键， {{dump(perfilServidor [5])}} ，它表示数组具有键0,1,2:

And if I try to access another key, {{ dump(perfilServidor[5]) }}, it says that the array have the keys 0,1,2:

具有键"0、1、2"的数组的键"5"不存在

Key "5" for array with keys "0, 1, 2" does not exist

我想获取数组的一个特定值(不遍历整个数组)如何在不遍历整个数组的情况下获取数组的值?

I want to get one specific value of the array (without looping through the whole array) How do I get the values of the array without looping through it?

推荐答案

即使我对您正在构建的应用程序一无所知，我也可以告诉您使用硬编码数组键是一种不好的做法，尤其是在模板内部.

Even if i don't know anything about the application that you are building, i can tell you that it is a bad practice to use hard coded array keys, especially inside a template.

如果只需要一项，则不应为模板提供整个数组.请记住，模板只是视图，而不是您的程序逻辑.

You should not give a whole array to a template if you only need one item. Remember that the template is only the view not your program-logic.

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