print_r($mysqli_result)

<?php
header("content-type:text/html;charset=utf-8");
$mysqli = @new mysqli('localhost', 'root', '', 'test');
if ($mysqli->connect_errno) {
    die("CONNECT ERROR : " . $mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$sql = "SELECT id,username,age FROM user";

$mysqli_result = $mysqli->query($sql);
print_r($mysqli_result);
?>

Paste_Image.png

$mysqli_result->num_rows

$mysqli_result->fetch_all()

<?php
header("content-type:text/html;charset=utf-8");
$mysqli = @new mysqli('localhost', 'root', '', 'test');
if ($mysqli->connect_errno) {
    die("CONNECT ERROR : " . $mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$sql = "SELECT id,username,age FROM user";
$mysqli_result = $mysqli->query($sql);

if ($mysqli_result && $mysqli_result->num_rows > 0) {
    echo $mysqli_result->num_rows;
    echo "<hr/>";
    $rows = $mysqli_result->fetch_all();
    print_r($rows);
}
?>

Paste_Image.png

$mysqli_result->fetch_all(MYSQLI_NUM)

$rows = $mysqli_result->fetch_all(MYSQLI_NUM);
    print_r($rows);

Paste_Image.png

$mysqli_result->fetch_all(MYSQLI_ASSOC)

Paste_Image.png

$mysqli_result->fetch_all(MYSQLI_BOTH)

Paste_Image.png

$mysqli_result->fetch_row()

if ($mysqli_result && $mysqli_result->num_rows > 0) {
    $rows = $mysqli_result->fetch_row();
    print_r($rows);
}

Paste_Image.png

$mysqli_result->fetch_assoc()

Paste_Image.png

$mysqli_result->fetch_array(MYSQLI_ASSOC)

Paste_Image.png

$mysqli_result->fetch_object()

Paste_Image.png

$mysqli_result->data_seek(1)

if ($mysqli_result && $mysqli_result->num_rows > 0) {
    $mysqli_result->data_seek(1);
    $row = $mysqli_result->fetch_assoc();
    print_r($row);
}

Paste_Image.png

读取

while ($row = $mysqli_result->fetch_assoc()) {
     print_r($row);
     echo "<hr/>";
     //$rows[]=$row;
}

释放结果集

$mysqli_result->close();

$mysqli_result->free();

$mysqli_result->free_result();

<?php
header("content-type:text/html;charset=utf-8");
$mysqli = @new mysqli('localhost', 'root', '', 'test');
if ($mysqli->connect_errno) {
    die("CONNECT ERROR : " . $mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$sql = "SELECT id,username,age FROM user";
$mysqli_result = $mysqli->query($sql);

if ($mysqli_result && $mysqli_result->num_rows > 0) {
    while ($row = $mysqli_result->fetch_assoc()) {
        print_r($row);
        echo "<hr/>";
        //$rows[]=$row;
    }

    //释放结果集
    $mysqli_result->close();
    //$mysqli_result->free();
    //$mysqli_result->free_result();

} else {
    echo "查询错误或者结果集中没有记录";
}

$mysqli->close();

?>

Paste_Image.png