用php数组定义方法有哪些？

数组名=array();

$aa[0]="9016";
 
$aa[1]="9017";
 
$aa[2]="9018";

foreach($aa as $val)
 
{
 
echo$val;
 
}

$aa=array(0=>"9016",1=>"9017";2=>"9018");

$aa["name"]="Joan";
 
$aa["num"]="9018";
 
$aa["email"]=<a href="mailto:abc@abc.com" rel="external nofollow">abc@abc.com</a>;

$aa=array("name"=>"joan","num"=>"9018","email"=><a href="mailto:abc@abc.com" rel="external nofollow">abc@abc.com</a>);

$aa=array(0=>"a1",1=>"a2");
 
$bb=array(0=>"b1",1=>"b2");
 
$cc=array(0=>$aa;1=>$bb);