mysqli_real_escape_string () / mysqli :: real_escape_string ใช้เพื่อตัดอักขระพิเศษในสตริงเพื่อใช้ในคำสั่ง SQL

การเขียนในรูปแบบ : Object oriented style

string mysqli::escape_string ( string $escapestr )

string mysqli::real_escape_string ( string $escapestr )

การเขียนในรูปแบบ : Procedural style

string mysqli_real_escape_string ( mysqli $link , string $escapestr )

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Parameter ที่มีการนำมาเข้ารหัส เช่น NUL (ASCII 0), \n, \r, \, ‘, “, and Control-Z.

ตัวอย่างรูปแบบ : Object oriented style

<?php
$mysqli = new mysqli("localhost", "user1", "bsru", "hr");

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}

$mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City");

$city = "bangkok";

/* this query will fail, cause we didn't escape $city */
if (!$mysqli->query("INSERT into myCity (Name) VALUES ('$city')")) {
printf("Error: %s\n", $mysqli->sqlstate);
}

$city = $mysqli->real_escape_string($city);

/* this query with escaped $city will work */
if ($mysqli->query("INSERT into myCity (Name) VALUES ('$city')")) {
printf("%d Row inserted.\n", $mysqli->affected_rows);
}

$mysqli->close();
?>

ตัวอย่างรูปแบบ : procedural style

<?php
$link = mysqli_connect("localhost", "user1", "buru", "hr");

/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}

mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City");

$city = "bangkok";

/* this query will fail, cause we didn't escape $city */
if (!mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {
printf("Error: %s\n", mysqli_sqlstate($link));
}

$city = mysqli_real_escape_string($link, $city);

/* this query with escaped $city will work */
if (mysqli_query($link, "INSERT into myCity (Name) VALUES ('$city')")) {
printf("%d Row inserted.\n", mysqli_affected_rows($link));
}

mysqli_close($link);
?>

Buraphon Srisuwan

นักวิชาการคอมพิวเตอร์ (ฝ่ายพัฒนาระบบสารสนเทศ)