二維陣列索引值有兩個，可視為兩個一維陣列。

➤$陣列命名 [索引值（列）] [索引值（行）] ＝ 值 ;

[0][0] | [0][1] |[0][2]
[1][0] | [1][1] |[0][2]
[2][0] | [2][1] |[2][2]

一一給予位置對應的值：

<?php 
＄classmate[0][0]="Alicia"; 
＄classmate[1][0]="Balo"; 
＄classmate[2][0]="Cindy"; 
?>

➤array()函式

行列對應的概念：

索引可以自己命名，當索引值為數字時可省略。

範例會更清楚：
1.

<?php 
$grade = array("Student_Alicia"=>array("Math"=>40,"English"=>100),
                "Student_Balo"=>array("Math"=>100,"English"=>80),
                "Student_cindy"=>array("Math"=>80,"English"=>70));
?>

<?php 
$Student_Alicia = array("Math"=>40,"English"=>100);
$Student_Balo = array("Math"=>100,"English"=>80);
$Student_cindy = array("Math"=>80,"English"=>70);
$grade = array($Student_Alicia,$Student_Balo,$Student_cindy);
?>

➤foreach迴圈：

foreach(陣列 as 變數){ echo 變數; }

<?php 
$classmate = array("Alicia","Balo","Cindy");
foreach($classmate as $name){
    echo $name."</br>";
}
?>

輸出：
Alicia
Balo
Cindy

foreach(陣列 as索引變數 => 變數){ echo 變數; echo 索引變數; }

<?php 
$classmate = array("girlfriend"=>"Alicia",
                    "bestfreind"=>"Balo",
                    "classleader"=>"Cindy");
foreach($classmate as $position => $name ){
    echo " my ".$position." is ".$name."</br>";
}
?>

輸出：
my girlfriend is Alicia
my bestfreind is Balo
my classleader is Cindy

印出二維陣列元素：雙層迴圈

<?php 
$grade = array(0=>array("Math"=>40,"English"=>100),
               1=>array("Math"=>100,"English"=>80),
               2=>array("Math"=>80,"English"=>70));
 
for($i = 0;$i<count($grade);$i++){
    foreach($grade[$i] as $subject => $score){
        echo $subject." score:".$score."</br>";
    }
}
?> 

輸出：
Math score:40
English score:100
Math score:100
English score:80
Math score:80
English score:70

先使用for迴圈，再使用foreach走訪所有元素。