printf和sprintf的应用

<?php printf('b: %b <br>c: %c <br>d: %d <bf>f: %f', 80,80, 80, 80);
echo '<br>';
printf('%0.2f <br>%+d <br>%0.2f <br>', 8, 8, 1235.456);

printf('the cost of %d %s at $%0.2f each is $%0.2f.', 4, 'brooms', 8.50, (4*8.50));

echo '<br>';
$tax = 30;
printf('The tax rate is %0.2f%%', $tax);
</bf>

    <meta charset="utf-8">
    <title>Sorting Multidimensional Arrays</title>


<?php $db = mysqli_connect('192.168.31.172', 'root', 'root', 'phpadvanced');
mysqli_query($db, "set names utf8");

if(!empty($_POST['task'])) {
    $parent_id = 0;
    if(isset($_POST['parent_id']) && filter_var($_POST['parent_id'], FILTER_VALIDATE_INT, ['min_range' => 1])) {
        $parent_id = $_POST['parent_id'];
    }

    $q = sprintf("INSERT INTO tasks (parent_id, task) VALUES (%d, '%s')", $parent_id, mysqli_real_escape_string($db, strip_tags($_POST['task'])));
    $r = mysqli_query($db, $q);

    if(mysqli_affected_rows($db) == 1) {
        echo '<p>任务添加成功</p>';
    } else {
        echo '<p>任务添加失败</p>';
    }
}
?>
    

添加一个任务

任务:

上级任务: 无上级 $task"; $tasks[] = ['task_id' => $task_id, 'parent_id' => $parent_id, 'task' => $task]; } ?>

$y['parent_id']); } usort($tasks, 'parent_sort'); echo '

当前的任务列表

'; foreach ($tasks as $task) { echo "
• {$task['task']}
\n"; } echo '

'; ?>

以上就介绍了printf和sprintf的应用，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。