php递归,静态变量,匿名函数使用

    <meta charset="utf-8">
    <title>Current To-Do List</title>


<?php function make_list($parent) {
        global $tasks;
        echo '<ol>';

        foreach($parent as $task_id => $todo) {
            echo "

$todo"; if (isset($tasks[$task_id])) { // 如果当前id有子任务则递归创建菜单 make_list($tasks[$task_id]); } echo "

"; } echo ''; } $db = mysqli_connect('192.168.31.172' ,'root', 'root', 'phpadvanced'); mysqli_query($db, "set names utf8"); $q = 'SELECT task_id, parent_id, task FROM tasks WHERE date_completed="0000-00-00 00:00:00" ORDER BY parent_id, date_added ASC'; $r = mysqli_query($db, $q); $tasks = array(); while (list($task_id, $parent_id, $task) = mysqli_fetch_array($r, MYSQLI_NUM)) { $tasks[$parent_id][$task_id] = $task; } //echo '

'.print_r($tasks,1).'

'; make_list($tasks[0]); //把包含顶级任务的数组发送给它, 最顶级的parent_id是0 ?>

<?php // create the array.
// Array structs
// StudentId = > ["name" => "Name", "grade" => xx.x];

$students = [
    256 => ['name' => 'Jon', 'grade' => '98.5'],
    2 => ['name' => 'Vance', 'grade' => '85.1'],
    9 => ['name' => 'Stephen', 'grade' => '94.0'],
    364 => ['name' => 'Steve', 'grade' => '85.1'],
    68 => ['name' => 'Rob', 'grade' => '74.6'],
];

function name_sort($x, $y) {
    static $count = 1;
    echo "<p>Iteration $count: {$x['name']} vs. {$y['name']} </p>\n";
    $count ++;
    return strcasecmp($x['name'], $y['name']);
}

function grade_sort($x, $y) {
    static $count = 1;
    echo "<p>Iteration $count: {$x['grade']} vs. {$y['grade']}</p>\n";
    $count++;
    return $x['grade'] 

<?php // create the array.
// Array structs
// StudentId = > ["name" => "Name", "grade" => xx.x];

$students = [
    256 => ['name' => 'Jon', 'grade' => '98.5'],
    2 => ['name' => 'Vance', 'grade' => '85.1'],
    9 => ['name' => 'Stephen', 'grade' => '94.0'],
    364 => ['name' => 'Steve', 'grade' => '85.1'],
    68 => ['name' => 'Rob', 'grade' => '74.6'],
];

echo print_r($students, 1);
uasort($students, function($x, $y){
    return strcasecmp($x['name'], $y['name']);
}); //保持键并使用自定义排序
echo print_r($students, 1);
uasort($students, function($x, $y){
    return $x['grade'] 

<?php function increment(&$i) {
    $i++;
}
$num = 2;
increment($num);
echo $num;

?>

以上就介绍了php递归,静态变量,匿名函数使用，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。