Linux编程之：五个常见PHP数据库问题

<?php
function get_user_id( $name )
{
$db = mysql_connect( 'localhost', 'root', 'password' );
mysql_select_db( 'users' );

$res = mysql_query( "SELECT id FROM users WHERE login='".$name."'" );
while( $row = mysql_fetch_array( $res ) ) { $id = $row[0]; }

return $id;
}

var_dump( get_user_id( 'jack' ) );
?>