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关于判断循环 Laravel 5 php


 @foreach($pages as $page)
                @if (count($page->nav_id) === 2)
                    <li><a href="/pages/{{ $page->id }}">{{ $page->title }}</a></li>
                @endif
@endforeach

数据库的内容是

图片描述

分 2中导航

现在是在视图里面做判断

当 nav_id = 2 的时候循环出来

这样做好像循环不出来哪里写错了吗

laravel5 php

10 years, 2 months ago

工口D大魔王

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工口D大魔王 10 years, 2 months ago

Answer 1

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楼上正解，count 是计算个数，而你的count($page->nav_id) 无关是如何计算，数值都是1， 1不等于2，所以循环不出

answered 10 years, 2 months ago

cdqclq

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cdqclq answered 10 years, 2 months ago

Answer 2

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把条件改为


 ($page->nav_id) === 2

answered 10 years, 2 months ago

舰队旗舰大淀号

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舰队旗舰大淀号 answered 10 years, 2 months ago

Answer 3

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int count ( mixed $var [, int $mode = COUNT_NORMAL ] )
count — 计算数组中的单元数目或对象中的属性个数

而你$page->nav_id本身就是一个值了，所以count($page->nav_id) 永远等于1，所以需要把count()去掉
直接$page->nav_id === 2 就可以判断了~~

answered 10 years, 2 months ago

SABERD

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SABERD answered 10 years, 2 months ago

关于判断循环 Laravel 5 php

工口D大魔王

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cdqclq

舰队旗舰大淀号

SABERD

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