php递归,静态变量,匿名函数使用
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2022-04-24 15:41:18
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递归读取任务列表代码 $todo";
if (isset($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] = $task;
}
//echo '
Current To-Do List '; foreach($parent as $task_id => $todo) { echo "
'.print_r($tasks,1).''; make_list($tasks[0]); //把包含*任务的数组发送给它, 最*的parent_id是0 ?>
静态变量统计次数代码
["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 "Iteration $count: {$x['name']} vs. {$y['name']}
\n"; $count ++; return strcasecmp($x['name'], $y['name']); } function grade_sort($x, $y) { static $count = 1; echo "Iteration $count: {$x['grade']} vs. {$y['grade']}
\n"; $count++; return $x['grade']
匿名函数--闭包代码
["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']
引用传参, 当数据是一个大数据的时候使用, 就不需要拷贝数据的副本了代码
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