在 PHP 中,有三種類型的數組:
- 數值數組 - 帶有數字 ID 鍵的數組
- 關聯數組 - 帶有指定的鍵的數組,每個鍵關聯一個值
- 多維數組 - 包含一個或多個數組的數組
看具體實例:
創建數組
<?php
//方式 1
$cars = array("Volvo","BMW","Toyota");
//方式 2
$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";
//方式 3
$cars = [
"Volvo",
"BMW",
"Toyota",
]
?>
<?php
$cars = array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>
獲取數組的長度 - count () 函數
<?php
$cars = array("Volvo","BMW","Toyota");
echo count($cars);
?>
遍歷數組
<?php
$cars = array("Volvo","BMW","Toyota");
//第一種方式
$arrlength = count($cars);
for($x = 0 ;$x < $arrlength ;$x++) {
echo $cars[$x];
echo "<br>";
}
//第二種方式
foreach ($cars as $key => $value){
echo $value;
echo "<br/>";
}
?>
array_chunk () 函數 (把數組分割爲帶有兩個元素的數組塊)
<?php
$cars = array("Volvo","BMW","Toyota","Honda","Mercedes","Opel");
print_r(array_chunk($cars,2));
?>
array_keys () 函數 (返回包含數組中所有鍵名的一個新數組)
<?php
$a = array("Volvo"=>"XC90","BMW"=>"X5","Toyota"=>"Highlander");
print_r(array_keys($a));
?>
array_push () 函數 (向數組尾部插入 “blue” 和 “yellow”)
<?php
$a = array("red","green");
array_push($a,"blue","yellow");
print_r($a);
?>
array_pop () 函數 (刪除數組中的最後一個元素)
<?php
$a = array("red","green","blue");
array_pop($a);
print_r($a);
?>
array_reverse () 函數 (返回翻轉順序的數組)
<?php
$a = array("a"=>"Volvo","b"=>"BMW","c"=>"Toyota");
print_r(array_reverse($a));
?>
sort () 函數 (對數組中的元素按字母進行升序排序)
<?php
$cars = array("Volvo","BMW","Toyota");
sort($cars);
?>
以上是簡單更新部分 PHP 常用數組基礎,如需瞭解更多請參考手冊,或者關注公衆號 (Laravel 技術社區 / PHP 在線中心),管理員將定期更新你不知道或不常用的知識點,幫助大家快速提升。