一番下の</html>でエラーがでるのですが、原因が分かりません。

PHP
1<!DOCTYPE html>
2<html lang="ja">
3    <head>
4        <meta charset="UTF-8">
5        <title>keijiban.php</title>
6    </head>
7    <body>
8        <?php
9        $filename="keijiban.txt";
10        $date=date("Y/m/d H:i:s");
11        if(!empty($_POST["str"] && $_POST["name"]) && empty($_POST["delete"]) && empty($_POST["edit"])){
12            $sentence = file($filename, FILE_IGNORE_NEW_LINES);
13            $number = 1;
14            if(!empty($sentence)){
15                foreach($sentence as $lines){
16                    $pieces = explode("<>",$lines);
17                    $number = $pieces[0] + 1;
18                    continue;
19                }
20            }
21            $str = $number."<>".$_POST["name"]."<>".$_POST["str"]."<>".$date.PHP_EOL;
22            $fp = fopen($filename,"a");
23            fwrite($fp,$str);
24            fclose($fp);
25            echo"書き込みました。<br><br>";
26        }
27        if(!empty($_POST["delete"]) && empty($_POST["name"] && $_POST["str"])){
28            $lines = file($filename, FILE_IGNORE_NEW_LINES);
29            $tmp = "";
30            foreach($lines as $line){
31                $pieces = explode("<>",$line);
32                if($pieces[0] != $_POST["delete"]){
33                    $tmp = $tmp.$line.PHP_EOL;
34                    continue;
35                }
36                $fp = fopen($filename,"w");
37                fwrite($fp,$tmp);
38                fclose($fp);
39                echo"削除しました。<br><br>";
40            }
41            if(!empty($_POST["delete"]) && !empty($_POST["name"] || $_POST["str"])){
42                echo"書き込みと削除は同時にできません。<br><br>";
43            }
44            if(empty($_POST["delete"] && $_POST["name"] && $_POST["str"]) && !empty($_POST["change"])){
45                $editnumber = $_POST["change"];
46                echo"編集モードです。<br><br>";
47            }
48            if(empty($_POST["delete"]) && !empty($_POST["name"] && $_POST["str"] && $_POST["edit"])){
49                $correct = "<>".$_POST["name"]."<>".$_POST["str"]."<>".$date.PHP_EOL;
50                $lines = file($filename,FILE_IGNORE_NEW_LINES);
51                $tmp = "";
52                foreach($lines as $line){
53                    $pieces = explode("<>",$line);
54                    if($pieces[0] != $_POST["edit"]){
55                        $tmp = $tmp.$line.PHP_EOL;
56                    }
57                    else if($pieces[0] == $_POST["edit"]){
58                        $tmp = $tmp.$pieces[0].$correct;
59                    }
60                    continue;
61                }
62                $fp = fopen($filename,"w");
63                fwrite($fp,$tmp);
64                fclose($fp);
65                echo "編集しました。<br><br>";
66            }
67            ?>
68        }
69    <form>
70        <input type = "text" name = "name" placeholder = "名前" value =
71        <?php
72        if(!empty($_POST["change"])){
73        echo $editname;
74        }
75        ?>><br>
76        <input type = "text" name = "str" placeholder = "コメント" value =
77        <?php
78        if(!empty($_POST["change"])){
79        echo $editline;
80        }
81        ?>>
82        <button type = "submit" name = "submit">投稿</button><br>
83        <input type = "hidden" name = "edit" value =
84        <?php
85        if(!empty($_POST["change"])){
86        echo $editnumber;
87        }
88        ?>><br>
89        <input type = "number" name = "delete" placeholder = "削除対象番号">
90        <button type = "submit" name = "submit">削除</button><br><br>
91        <input type = "number" name = "change" placeholder = "編集対象番号">
92        <button type = "submit" name = "submit">編集</button>
93    </form>
94    <?php
95    if(file_exists($filename)){
96        $lines = file($filename,FILE_IGNORE_NEW_LINES);
97        foreach($lines as $line){
98            $pieces = explode("<>",$line);
99            echo $pieces[0]."".$pieces[1]."".$pieces[2]."".$pieces[3]."<br>";
100        }
101    }
102    ?>
103    </body>
104</html>