fetch_array()
是 PHP 中的一個函數(shù),它用于從結(jié)果集中獲取一行作為數(shù)組
users
的表:CREATE TABLE users (
id INT AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(255) NOT NULL,
email VARCHAR(255) NOT NULL
);
INSERT INTO users (name, email) VALUES ('張三', 'zhangsan@example.com');
INSERT INTO users (name, email) VALUES ('李四', 'lisi@example.com');
<?php
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";
// 創(chuàng)建連接
$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
?>
fetch_array()
函數(shù)從結(jié)果集中獲取一行數(shù)據(jù):<?php
$sql = "SELECT id, name, email FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 輸出每行數(shù)據(jù)
while($row = $result->fetch_array()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>";
}
} else {
echo "0 結(jié)果";
}
$conn->close();
?>
上述代碼會從 users
表中獲取所有數(shù)據(jù),并使用 fetch_array()
函數(shù)遍歷結(jié)果集,將每行數(shù)據(jù)輸出到瀏覽器。注意,fetch_array()
默認返回一個包含數(shù)字索引和關(guān)聯(lián)鍵名的數(shù)組,但您也可以通過傳遞一個可選參數(shù)來改變返回的數(shù)組類型。例如,要返回關(guān)聯(lián)數(shù)組,請使用 MYSQLI_ASSOC
常量:
while($row = $result->fetch_array(MYSQLI_ASSOC)) {
// ...
}
或者,要返回數(shù)字索引數(shù)組,請使用 MYSQLI_NUM
常量:
while($row = $result->fetch_array(MYSQLI_NUM)) {
// ...
}