php学习01数组

print_r //打印输出数组
创建数组1
$ay=array('abc'=>'xxx','ddd'=>333,....);
创建数组2
$ay=['abc'=>'xxx','ddd'=>333,....]; //和1差不多。只不过array去掉。括号()换[]

直接赋值
$ay['abc']='xxx';
$ay['HHH']=33

引用传参==改变原有数组