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PHP數組相關講解

巴扎黑
巴扎黑原創
2017-08-04 17:48:271148瀏覽

對於網頁程式設計來說,最重要的就是存取和讀寫資料了。儲存方式可能​​有很多種,可以是字串、陣列、檔案的形式等

今天學習了數組,可以說是PHP的資料應用中較重要的一種方式。 PHP的陣列函數眾多,下面是我學習的小結,藉此記之,便於以後鑑之…
  一、數組定義:
  數組的定義使用array()方式定義,可以定義空數組:

複製程式碼 程式碼如下:


$number = array(1,3 ,5,7,9);
//定義空數組
$result = array();
$color =array("red","blue","green");
//自訂鍵值
$language = (1=>"English",3=>"Chinese",5=>"Franch");
//定義二維陣列
$two = array(
"color"=>array("red","blue"), //用逗號結尾
"week"=>array("Monday","Friday") / /最後一句沒有標點
);
?>


#二、建立陣列:
  建立陣列包含的函數有compact( )、
    1.compact()函數-將一個或多個變數(包含陣列)轉換為陣列:
      array compact (#mixed $varname [, mixed $... ] )  array compact (#mixed $varname [, mixed $... ] )  

#複製程式碼

程式碼如下:

$number = "1,3,5,7,9";
$ string = "I'm PHPer";
$array = array("And","You?");
$newArray = compact("number","string","array");
print_r ($newArray);
?>


#compact()函數用於將兩個或多個變數轉換為數組,當然也包含數組變數。其參數是變數的名稱而非帶有$全名。

      相反的函數是extract()作用顧名思義就是將數組轉換為單一的字串,鍵值作為其字串名稱,數組值作為字串的值。
      運行結果:


複製程式碼

程式碼如下:

Array ( [number] => 1,3,5,7 ,9 [string] => I'm PHPer [array] => Array ( [0] => And [1] => You? ) )



2 .array_combine()——將兩個數組重組成一個數組,一個作鍵值一個做的值:

      array array_combine ( array $keys , array $values )


複製程式碼

程式碼如下:

$number = array("1","3","5","7","9");
$array = array("I","Am","A","PHP","er");
$newArray = array_combine($number,$array);
print_r ($ newArray);
?>


array_combine函數不多說了,誰看了都明白

      運行結果:

Array ( [1] => I [3] => Am [5] => A [7] => PHP [9] => er )
    3.range()函數-建立指定範圍的陣列:
       不多說了,直接上實例—


複製程式碼

程式碼如下:

#$ array1 = range(0,100,10);//0為起始值,100為結束值,10為步進值(預設步進值為1).
print_r($array1);
echo"
";
$array2 = range("A","Z");
print_r($array2);
echo "
";
$array3 = range("z","a");
print_r($array3);
?>


range()函數的預設步進值是1!

      運行結果:


#複製程式碼

程式碼如下:


Array ( [0] => 0 [1] => 10 [2] => 20 [3] => 30 [4] => 40 [5] => 50 [6] => 60 [7] => 70 [9] => 90 [10] => 100 )
陣列( [0] => A [1 ] => B [2] => D [4] => E [6 ] => H [8] => I [9] => K [11] => M [13] => O [15] = > P[16] => Q[18] => S[20] = > V[22] ; W [23] => X [24] => Y [25] => Z )
Array ( [0] => z [1] => y [2] => x [ 3] => v [6] => s [8] => q [ 10]=>o[12]=>n[14]=>l[16]=>j[17] ] => h [19 ] => g [21] => e [23] => c [24] => b [25] => a )


4.array_fill()函數-填充陣列函數:

複製程式碼 程式碼如下:


#$array = range(1,10);
$fillarray = range("a","d");
$arrayFilled = array_fill(0,5,$fillarray);//這裡的$fillarray可以是字串,如"test".
echo "

"; <br>print_r ($arrayFilled); <br>echo "
";
$keys = array("字串","2",9,"SDK","PK");
$array2 = array_fill_keys($keys,"測試");
echo "
"; <br>print_r ($array2); <br>echo "
";


執行結果:

複製程式碼 程式碼如下:


Array
(
[0] => 陣列
(
[0] => a
[1] => b
[2] => c
[3] = > d
)
[1] => 陣列
(
[0] => a
[1] => b
[2] => c
[3] => d
)
[2] => 陣列
(
[0] => a
[1] => b
[2] => c
[3 ] => d
)
[3] => 陣列
(
[0] => a
[1] => b
[2] => c
[3] => d
)
[4] => 陣列
(
[0 ] => a
[1] => b
[2] => c
[3] => d
)
陣列
(
[string] => 測試
[2] => 測試
[9] => 測試
[SDK] => 測試
[PK] => test
)

#二、 吞吐的遍歷:
##1.foreach 遍歷:


##foreach (array_expression as $value){}

##foreach (array_expression as $key => $value){}

##複製程式碼如下:



$speed = array(50,120,180,240,380);
foreach($speed as $keys=>$values){
echo $keys."=>".$values."
";
}



執行結果:

複製程式碼

# 程式碼如下:



#0=>50
1=>120
2=>180
3=>240
4=>380



2.while 迴圈遍歷:

# while 迴圈遍歷一般結合清單函數,以下是實例


# 複製程式碼
程式碼如下:

##< ?PHP ##$ Staff = array(
array("姓名","性別","年齡"),
array("小張","男",24),
array("小王","女",25),
array("小李","男",23)
);
echo "<表格邊框=2>";
while(list($keys,$value) = every($staff)){
list($name,$sex,$age) = $value;
echo "$name$sex$age";
}
echo "";



執行結果:##小張男24小王女25小李男
#名稱
####23############

3.for迴圈遍歷:

複製程式碼 程式碼如下:


$speed = range( 0,220,20);
for($i =0;$iecho $speed[$i]." ";
}
? >


運行結果:

複製程式碼 程式碼如下:


0 20 40 60 80 100 120 140 160 180 200 220

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