質問編集履歴
2
修正
test
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File without changes
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test
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@@ -1,6 +1,26 @@
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1
1
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ユーザーがユニークかどうか調べるコードで疑問が出てきたので質問させてください。
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2
2
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3
3
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以下のSQL文で取り出した**$row['count']**はなぜ文字列になるのでしょうか？
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4
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+
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5
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'0'にしないとtrueにならないです。
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6
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+
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7
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+
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8
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9
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【追記】
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10
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11
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```PHP
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12
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13
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// false
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14
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+
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15
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$row['count'] === 0
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16
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17
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18
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19
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//true
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20
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21
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$row['count'] === '0'
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22
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23
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```
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4
24
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5
25
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6
26
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1
継承しているクラスのコードを追加しました
test
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File without changes
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test
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@@ -12,18 +12,52 @@
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12
12
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13
13
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```PHP
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14
14
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15
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-
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15
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+
class User extends Base
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16
16
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17
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-
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17
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+
{
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18
18
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19
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-
if ($row['count'] === '0') {
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20
19
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20
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+
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21
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public function isUnique($user_name) {
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22
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23
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24
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25
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$sql = "SELECT COUNT(id) as count FROM user WHERE user_name = :user_name";
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26
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27
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$row = $this->fetch($sql, array(':user_name' => $user_name));
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28
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29
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if ($row['count'] === '0') {
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30
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21
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-
return true;
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31
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return true;
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32
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33
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}
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34
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35
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36
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37
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return false;
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38
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39
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}
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22
40
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23
41
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}
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24
42
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43
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+
```
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25
44
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26
45
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46
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+
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47
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+
```PHP
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48
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+
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27
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-
r
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49
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+
abstract class Base
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50
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51
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{
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52
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53
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public function fetch($sql, $params = array())
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54
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55
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{
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56
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57
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return $this->execute($sql, $params)->fetch(PDO::FETCH_ASSOC);
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58
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+
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59
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}
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60
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+
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61
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}
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28
62
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29
63
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```
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