Question

HI以下是代码，我正在尝试打印包含下拉菜单值的数组然后第二个foreach循环试图选择该字段。输出是我想要的方式，意味着它打印所有菜单项，以及所选的一个，

foreach($results as $data): 
        $st = '';
        foreach($SelectedActor as $SelectedActor):
        if($SelectedActor['id']==$data['id']){$st='selected="selected"';}
         endforeach;
        $dd .="<option ".$st."  value=".$data['id']."> ".$data['artist_name']."    </option>";

        endforeach;

但该页面也显示此错误

A PHP Error was encountered

Severity: Warning

Message: Illegal string offset 'id'

Filename: controllers/replik.php

Line Number: 328

这两个阵列的Vardump是

array (size=2)
  0 => 
    array (size=2)
      'id' => string '1' (length=1)
      'artist_name' => string ' oyuncu' (length=19)
  1 => 
    array (size=2)
      'id' => string '4' (length=1)
      'artist_name' => string 'hep brabir' (length=10)

array (size=2)
  0 => 
    array (size=2)
      'id' => string '1' (length=1)
      'artist_name' => string 'oyuncu' (length=19)
  1 => 
    array (size=2)
      'id' => string '4' (length=1)
      'artist_name' => string 'hep brabir' (length=10)

任何人都可以帮我解决这个错误。

Answer 1

 foreach($SelectedActor as $SelectedActor):
        if($SelectedActor['id']==$data['id']){$st='selected="selected"';}

这里使用相同名称$SelectedActor，也许

foreach($SelectedActor as $ItemSelectedActor):
            if($ItemSelectedActor['id']==$data['id']){$st='selected="selected"';}

没问题

Answer 2

下面的行是错误的：

foreach($SelectedActor as $SelectedActor)

你需要这样做：

foreach($SelectedActor as $actor):
    if($actor['id']==$data['id']){
        $st='selected="selected"';
    }
endforeach;

非法字符串偏移foreach循环

2 个答案: