printf和sprintf的应用-php教程-PHP中文网

printf和sprintf的应用

巴扎黑

发布： 2016-11-10 13:51:04

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1747人浏览过

<?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);

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sprint可以把查询和数据很好的分开代码

<!doctype html>  
<html lang="en">  
<head>  
    <meta charset="utf-8">  
    <title>Sorting Multidimensional Arrays</title>  
</head>  
<body>  
<?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>
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                        </a>
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                        </div>
                        <a href="/ai/appmall%E5%BA%94%E7%94%A8%E5%95%86%E5%BA%97" class="aritcle_card_btn">
                            <span>查看详情</span>
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                    </div>
                ';  
    }  
}  
?>  
    <form action="add_task.php" method="post">  
        <fieldset>  
            <legend>添加一个任务</legend>  
            <p>任务: <input name="task" type="text" size="60" maxlength="100" required> </p>  
            <p>上级任务: <select name="parent_id">  
                    <option value="0">无上级</option>  
  
                    <?php  
                    $q = 'SELECT task_id, parent_id, task FROM tasks WHERE date_completed="0000-00-00 00:00:00" ORDER BY date_added ASC';  
                    $r = mysqli_query($db, $q);  
                    $tasks = [];  
                    while(list($task_id, $parent_id, $task) = mysqli_fetch_array($r, MYSQLI_NUM)) {  
                        echo "<option value=\"$task_id\">$task</option>";  
                        $tasks[] = ['task_id' => $task_id, 'parent_id' => $parent_id, 'task' => $task];  
                    }  
                    ?>  
                </select></p>  
            <input name="submit" type="submit" value="添加这个任务" />  
        </fieldset>  
    </form>  
  
<?php  
    // 对任务的父id进行排序  
    function parent_sort($x, $y) {  
        return ($x['parent_id'] > $y['parent_id']);  
    }  
    usort($tasks, 'parent_sort');  
    echo '<h2>当前的任务列表</h2><ul>';  
    foreach ($tasks as $task) {  
        echo "<li>{$task['task']}</li>\n";  
    }  
echo '</ul>';  
?>  
</body>  
</html>

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