IPhoneIOS:PHP脚本执行时间太长

我正试图在我的应用程序中运行一个php脚本，该脚本将根据数据库中的登录变量检查用户的登录变量。下面的代码是我执行该文件的方式。我正在运行脚本，然后将结果存储在数组中。"是"结果表示用户的登录数据是正确的，"否"结果表示不正确。

这个代码是有效的，但是我的问题是时间。我已经设置了定时器，即使我的php文件是BLANK，执行第一个块也需要8秒。其他一切，甚至加载下一页要快得多(最多3秒(

//first block
NSString * post = [NSString stringWithFormat:@"userId=%@&password=%@",userId.text,password.text];
NSString * hostStr = @"http://domain.com/check_login.php?";
hostStr = [hostStr stringByAppendingString:post];       
NSURL *location = [NSURL URLWithString:hostStr];
NSDictionary *dictionaryData = [[ NSDictionary alloc ] initWithContentsOfURL:location ];
//second block
NSArray *resultArray = [dictionaryData objectForKey:@"result"];
NSArray *loginidArray = [dictionaryData objectForKey:@"loginid"];
NSArray *usernameArray = [dictionaryData objectForKey:@"username"];

同样，在第一个代码块期间，大约4次中有1次，我得到了这样的错误"SendDelegateMEssage:delegate在等待10秒后未能返回。main运行循环模式：_kCFURLConnectionPrivateRunLoopMode"。我一直在试着查找它，但根据我的代码，我不知道它在里面意味着什么。当我得到这个错误时，代码可能需要30-60秒才能执行！！！

任何指示都将不胜感激。

谢谢，

Amanda

编辑以包含PHP，因为了解代码中服务器端发生的事情会很有帮助。

<?php
header('Content-type: text/xml');
session_start();
echo "<?xml version='"1.0'" encoding='"UTF-8'"?>'n<!DOCTYPE plist SYSTEM '"file://localhost/System/Library/DTDs/PropertyList.dtd'">'n<plist version='"1.0'">'n";
$username = "user";
$password = "pass";
$host = "localhost";
$database = "database";
// Make the connect to MySQL or die
// and display an error.
$link = mysql_connect($host, $username, $password);
if (!$link) {
die('Could not connect: ' . mysql_error());
error_log("CANT CONNECT DB"); 
}
else
{
error_log("DB CONNECTED");
}

mysql_select_db ($database);

    $userId     = $_GET['userId'];
    $password   = $_GET['password'];

    $sql = "SELECT user_login_id,userid from user_login WHERE userId ='". $userId ."'   AND password ='".$password."'";
    $rs_login = mysql_query($sql, $link) or die (mysql_error());
    if(mysql_num_rows($rs_login) ==1)
    {
        $row = mysql_fetch_array($rs_login ); 
        $user_login_id = $row['user_login_id']; 
        $user_login_name = $row['userid'];
    // The data that needs to be transferred:
    $my_data = array();
    $my_data["result"]      = array("YES");
    $my_data["loginid"]     = array($user_login_id);
    $my_data["username"]     = array($user_login_name);
    // Open the dictionary
    echo "<dict>'n";
    // Putting the data into the plist format
    foreach ($my_data as $key => $array) 
    {
    // Loop for every value in $my_data
    echo "    <key>$key</key>'n    <array>'n"; // Make a key with the key from $my_data and open an array for it's values.
    foreach ($array as $value) 
    { // Go through every value in the current array from $my_data
        echo "        <string>$value</string>'n"; // Print the value as a string in  the array
    }
    echo "    </array>'n"; // Close the array
    }
    echo "</dict>'n</plist>'n"; // Close the dictionary & plist 
}
else
{
    $my_data["result"] = array("NO");
    $my_data["loginid"] = array("--");
    $my_data["username"]     = array("--");
    // Open the dictionary
    echo "<dict>'n";
    // Putting the data into the plist format
    foreach ($my_data as $key => $array) 
    {
    // Loop for every value in $my_data
    echo "    <key>$key</key>'n    <array>'n"; // Make a key with the key from $my_data and open an array for it's values.
    foreach ($array as $value) 
    { // Go through every value in the current array from $my_data
        echo "        <string>$value</string>'n"; // Print the value as a string in the array
    }
    echo "    </array>'n"; // Close the array
    }
    echo "</dict>'n</plist>'n"; // Close the dictionary & plist

}
mysql_free_result($rs_login);
?>

解决方案
这是我使用的，现在登录只需要4秒。。。谢谢大家。

NSHTTPURLResponse * response = nil;
NSError* error = nil;
NSString * post = [NSString stringWithFormat:@"userId=%@&password=%@",userId.text,password.text];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%d", [postData length]];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL: [NSURL URLWithString:@"http://domainname.com/check_login.php?"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSData *returnData = [NSURLConnection sendSynchronousRequest:request 
                                           returningResponse:&response 
                                                       error:&error];
NSString *result = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSString *errorDesc = nil;
NSPropertyListFormat format;
NSDictionary *temp = (NSDictionary *)[NSPropertyListSerialization
                                      propertyListFromData:returnData
                                      mutabilityOption:NSPropertyListMutableContainersAndLeaves
                                      format:&format
                                      errorDescription:&errorDesc];
if (!temp) {
    NSLog(@"Error reading plist: %@, format: %d", errorDesc, format);
}
NSArray *resultArray = [temp objectForKey:@"result"];
NSArray *loginidArray = [temp objectForKey:@"loginid"];
NSArray *usernameArray = [temp objectForKey:@"username"];