php - 从视频中选择 * WHERE url = substring($url, 0, 5)

Question

通常，视频网址类似于 site.com/watch?v=abcde.flv 我希望新网址为 site.com/watch?v=abcde

通常是: $url = $_GET['v']; 然后

$query = mysql_query("SELECT * FROM videos WHERE url = '$url'");

如何只使用前 5 个字符？

这是我尝试过的方法，但不起作用:

$newurl = substr($url, 0, 11);

然后

$query("SELECT FROM videos WHERE substring(url, 0,11) = '$newurl'");

Answer 1

SQL 中字符串解析的正确语法是:

LEFT ( character_expression , integer_expression )

查看更多信息: https://msdn.microsoft.com/en-ca/library/ms177601.aspx

就您而言:

//assuming your new url of watch?v=abcde
$url = $_GET['v']; 

//assuming the video in your databse is stored as abcde.flv
$query = mysql_query("SELECT FROM videos WHERE LEFT(url,5) = '$url'");