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<?phpecho 'a'; // 用于输出字符串function sum(int $a, int $b): int{return $a + $b;}echo sum(4.8, 2);echo '<pre>';$arr = ['php', 'java', 'python']; // 索引数组// 同上 $arr = array('php', 'java', 'python');var_dump($arr); //打印数组，信息全print_r($arr); // 输出数组echo '<hr>';$user = array('id' => 1, 'name' => 'hao', 'email' => 'hao@qq.com');print_r($user);$navs = ['首页', '视频教程', '学习路径', 'PHP培训新', '资源下载', '"技术文章'];$nav = '';for ($i = 0; $i < count($navs); $i++) {$nav .= "<a href='' style='padding:0 15px'>$navs[$i]</a>";}echo $nav;$navs = [['id'=>1, 'name'=>'视频教程', 'url'=>'https://www.aqy.com'], ['name'=>'学习路径', 'url'=>'https://www.aqy.com'], ['name'=>'PHP培训新', 'url'=>'https://www.aqy.com'], ['name'=>'资源下载', 'url'=>'https://www.aqy.com'], ['name'=>'技术文章', 'url'=>'https://www.aqy.com']];$nav = '';for ($i = 0; $i < count($navs); $i++) {$nav .= "<a href='{$navs[$i]['url']}' style='padding:0 15px'>{$navs[$i]['name']}</a>";}echo $nav;$nav2 = '';foreach($navs as $k=>$v){$nav2 .= "<a href='{$v['url']}' style='padding:0 15px'>{$v['name']}</a>";}echo $nav2;$nav3 = '';foreach($navs as $k=>$v){extract($v); // 从关联数组中键名为变量，值为变量的值。$nav3 .= "<a href='{$url}' style='padding:0 15px'>{$name}</a>";}echo $nav3;echo @$b; // @屏蔽错误//变量大小写敏感；函数大小写不敏感；// list() 不是函数，是一种结构list($a, $b, $c) = $arr; // 批量赋值echo $a, $b;ob_clean();?><!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>提交表单</title></head><body><form action="test.php" method="post"><label for="uname">用户名</label><input type="text" name="uname" id="uname"><br><label for="pwd">密码：</label><input type="password" name="pwd" id="pwd"><button>提交</button></form></body></html><?phpclass NbaPlayer{public $name;public $team;function play(){}}$james = new NbaPlayer; // 对象都需要实例化var_dump($james);?><script>// js对象有三种，内部对象new（内置对象）；宿主对象DOM BOM; 自定义对象var d = new Date();d.getDay();// alert(d.getDay()); //星期// alert(d.getHours());// alert(navigator.appCodeName); //内核// alert(navigator.platform); //系统</script><?php$handle = fopen('data.txt', 'r'); // 返回指针资源var_dump($handle); //resource(3) of type (stream)// $con = fread($handle,10); // 读取10个字节$con = fread($handle,filesize('data.txt'));echo $con;$pdo = new PDO('mysql:host=localhost; dbname=video', 'root', 'root');var_dump($pdo); // 对象类型object(PDO)#2 (0) { }$ch = curl_init();var_dump($ch); //resource(5) of type (curl)// null 不是0，不是false，是未定义或清空的变量，是空
根据视频内容又自己演练了一遍，没有什么难以理解的内容。