php递归,静态变量,匿名函数使用
php  /  管理员 发布于 2年前   100
<!doctype html><html lang="en"><head> <meta charset="utf-8"> <title>Current To-Do List</title></head><body><?php function make_list($parent) { global $tasks; echo '<ol>'; foreach($parent as $task_id => $todo) { echo "<li>$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 "</li>"; } echo '</ol>'; } $db = mysqli_connect('192.168.31.172' ,'root', 'root', 'phpadvanced'); mysqli_query($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] = $task;}//echo '<pre>'.print_r($tasks,1).'</pre>';make_list($tasks[0]); //把包含顶级任务的数组发送给它, 最顶级的parent_id是0?></body></html>
<?php// create the array.// Array structs// StudentId = > ["name" => "Name", "grade" => xx.x];$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'] < $y['grade'];}echo print_r($students, 1);uasort($students, 'name_sort'); //保持键并使用自定义排序echo print_r($students, 1);uasort($students, 'grade_sort');echo print_r($students, 1);?>
<?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'] < $y['grade'];});echo print_r($students, 1);?>
<?phpfunction increment(&$i) { $i++;}$num = 2;increment($num);echo $num;?>
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