PDO bindParam 和 bindValue 差別在哪裡?
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以下範例：
bindParam
＜?php
try {
$dbh = new PDO("mysql:host=localhost;dbname=test", "root", "");
$dbh-＞setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh-＞prepare("SELECT * FROM tablename WHERE number = ?");
$stmt-＞bindParam(1, $test_value, PDO::PARAM_INT);
$test_value = 888;
$stmt-＞execute();
print_r($stmt-＞fetchAll());
} catch(PDOException $e) {
echo $e-＞getMessage();
}
?＞ 執行正常。
bindValue
＜?php
try {
$dbh = new PDO("mysql:host=localhost;dbname=test", "root", "");
$dbh-＞setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh-＞prepare("SELECT * FROM tablename WHERE number = ?");
$stmt-＞bindValue(1, $test_value, PDO::PARAM_INT);
$test_value = 888;
$stmt-＞execute();
print_r($stmt-＞fetchAll());
} catch(PDOException $e) {
echo $e-＞getMessage();
}
?＞ 輸出：Notice: Undefined variable: test_value
以上紀錄。
https://innstory.com/story-PDO_bindParam_和_bindValue_差別在哪裡-2375
