分享一些常用的PHP数组函数

$colors = array("Red", "Green", "Blue");

$numbers = array(1, 2, 3, 4, 5);echo count($numbers); // 输出 5

$fruits = array("Apple", "Orange", "Banana");array_push($fruits, "Pear", "Mango");print_r($fruits);

Array(    [0] => Apple    [1] => Orange    [2] => Banana    [3] => Pear    [4] => Mango)

$fruits = array("Apple", "Orange", "Banana");$last_fruit = array_pop($fruits);echo $last_fruit; // 输出 Banana

$fruits = array("Apple", "Orange", "Banana");$first_fruit = array_shift($fruits);echo $first_fruit; // 输出 Apple

$fruits = array("Apple", "Orange", "Banana");array_unshift($fruits, "Grape", "Pineapple");print_r($fruits);

Array(    [0] => Grape    [1] => Pineapple    [2] => Apple    [3] => Orange    [4] => Banana)

$fruits = array("Apple", "Orange", "Banana", "Grape");$selected_fruits = array_slice($fruits, 1, 2);print_r($selected_fruits);

Array(    [0] => Orange    [1] => Banana)

$fruits1 = array("Apple", "Orange", "Banana");$fruits2 = array("Grape", "Pineapple");$all_fruits = array_merge($fruits1, $fruits2);print_r($all_fruits);

Array(    [0] => Apple    [1] => Orange    [2] => Banana    [3] => Grape    [4] => Pineapple)

$numbers = array(1, 2, 3, 4, 5);$key = array_search(3, $numbers);echo $key; // 输出 2

$fruits = array("Apple", "Orange", "Banana");$keys = array_keys($fruits);print_r($keys);

Array(    [0] => 0    [1] => 1    [2] => 2)