Post email变量到PHP在iOS Xcode

我试图从iOS Xcode到PHP发布一个变量。下面是我的脚本，但是email变量不会在我的PHP中发布:

php code $email_from = $_POST['email'];

认为email将来自iOS。

    //Start of general request setup
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:serverLink]];
[request setHTTPMethod:httpMethod];
[request setTimeoutInterval:connectionTimeout];
NSString *stringBoundary = [NSString stringWithString:@"0xKhTmLbOuNdArY"];
NSString *contentType    = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", stringBoundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];
NSString *email =[NSString stringWithFormat:@"ryan"];
//End of general request setup

//Start of body setup
NSArray *parametersKeys = [parameters allKeys];
NSArray *imagesKeys = [images allKeys];
NSMutableData *postBody = [NSMutableData data];
[postBody appendData:[[NSString stringWithFormat:@"'r'n'r'n--%@'r'n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
BOOL addedData = NO;
for (NSString *parameterKey in parametersKeys) {
    if (addedData) {
        [postBody appendData:[[NSString stringWithFormat:@"'r'n--%@'r'n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    }
    else {
        addedData = YES;
    }
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name='"%@'"'r'n'r'n", parameterKey] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"%@", [parameters objectForKey:parameterKey]] dataUsingEncoding:NSUTF8StringEncoding]];
}
for (NSString *imageKey in imagesKeys) {
    if (addedData) {
        [postBody appendData:[[NSString stringWithFormat:@"'r'n--%@'r'n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    }
    else {
        addedData = YES;
    }
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name='"%@'"; filename='"%@.jpg'"'r'n", imageKey, imageKey] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[@"Content-Type: image/jpeg'r'n'r'n" dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; email='"%@'"'r'n""", email] dataUsingEncoding:NSUTF8StringEncoding]];
    [postBody appendData:[images objectForKey:imageKey]];
}    
[postBody appendData:[[NSString stringWithFormat:@"'r'n--%@--'r'n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
[request setHTTPBody:postBody];
//End of body setup
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
[parameters release];
[images release];
isSending = NO;