<?php
//创建交通工具信息数组$trans
$trans[]=['id'=>612,'name'=>'bus','weight'=>300,'capacity'=>22];
$trans[]=['id'=>1580,'name'=>'taxi','weight'=>210,'capacity'=>5];
$trans[]=['id'=>300,'name'=>'coach','weight'=>550,'capacity'=>86];

//打印输出$trans
print_r($trans);
//按效果图输出bus的承载量
print_r($trans[0]['capacity']);

//将交通工具motorbike的信息添加到数组
$trans[]=['id'=>105,'name'=>'motorbike','weight'=>100,'capacity'=>2];

//按要求修改原名为coach交通工具的信息并输出
$trans[2]=['id'=>300,'name'=>'truck','weight'=>300,'capacity'=>86];
print_r($trans);
unset($trans[0]['weight']);
unset($trans[1]);
print_r($trans);