$trans = array(

    array('id'=>'612','name'=>'bus','weight'=>'300','capacity'=>'22'),

    array('id'=>'1580','name'=>'taxi','weight'=>'210','capacity'=>'5'),

    array('id'=>'300','name'=>'coach','weight'=>'550','capacity'=>'86')

);

//打印输出$trans

print_r($trans);

echo '<hr/>';

//按效果图输出bus的承载量

echo  $trans['0']['weight'];

echo '<hr/>';

//将交通工具motorbike的信息添加到数组

$trans[]=['id'=>'105','name'=>'motorbike','weight'=>'100','capacity'=>'2'];

print_r($trans);

echo '<hr/>';

//按要求修改原名为coach交通工具的信息并输出

$trans['2']['name']='truck';

$trans['2']['weight']='350';

print_r($trans['2']);

echo '<hr/>';

//删除bus的载重属性，删除taxi交通工具（操作数组元素）

unset($trans['0']['weight']);

print_r($trans['0']);

unset($trans['1']['name']);

print_r($trans['1']);

老师看我写的对吗？