PHP 数组操作详解：定义、遍历、分割与检索

$arr1 = ['apple', 'banana', 'orange']; print_r($arr1); var_dump($arr1);

$arr2 = array('apple', 'banana', 'orange'); print_r($arr2); var_dump($arr2);

$arr3 = array('apple', 'banana', 'orange'); echo 'current element: ' . current($arr3) . '
'; for ($i = 0; $i < count($arr3); $i++) { echo $arr3[$i] . '
'; } foreach ($arr3 as $value) { echo $value . '
'; } echo 'current element: ' . current($arr3) . '
';

$str = '北京市、上海市、广州市、深圳市、杭州市、南京市、成都市、武汉市、西安市、重庆市'; $arr4 = explode('、', $str); foreach ($arr4 as $value) { echo $value . '
'; }

$library = array('book1', 'book2', 'book3', 'book4', 'book5'); if (isset($_POST['search'])) { $bookName = $_POST['bookName']; if (in_array($bookName, $library)) { echo $bookName . ' is in the library.'; } else { echo $bookName . ' is not in the library.'; } }