Question

在foreach我想访问数组值，数组看起来像这样。

Array
(
    ['name'] => John Doe
    ['age'] => 25
    ['from'] => Australia
)

如何获得name age和from的价值？

使用echo $item['name']并返回Undefined index: name。

Answer 1

如果您正在使用该数组进行预告，则只需要回显项目：

$the_array = array( 'name'=> "John Doe", 'age' => 25, 'from' => 'Oz');
foreach($the_array as $item){
   //the first iterations will echo out $the_array['name'], 
   //second $the_array['age'], etc...
   echo $item;

  //in this loop $item['name'] has no meaning if that's what you're doing....
}

现在，如果它真的是一个数组数组，你可以这样做

$the_array = array(array( 'name'=> "John Doe", 'age' => 25, 'from' => 'Oz'));
foreach($the_array as $item){
   foreach($item as $key=>$value){
       echo $key." ".$value;
   }

}

如果您没有肯定要设置回显的值，但不想要内循环：

foreach($the_array as $item){
   $name =isset($item['name']) ?$item['name'] : null;
    echo $name;
    $age =isset($item['age']) ?$item['age'] : null;
    echo $age;

    //...etc...


}

访问数组值返回Undefined index

1 个答案: