Parse error: syntax error, unexpected T_STRING

I am getting error at the second line of the code, what is the problem :-/

$content = '<' . '?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?' . '>';
$content .= "<entry xmlns='http://purl.org/atom/ns#'>";
$content .= "<title mode='escaped' type='text/plain'>".$title."</title>";
$content .= "<issued>".$issued."</issued>"
$content .= "<generator url='http://www.yoursitesurlhere.com'>client's name</generator>";
$content .= "<content type='application/xhtml+xml'>";
$content .= "<div xmlns='http://www.w3.org/1999/xhtml'>".$body."</div>";
$content .= "</content>";
$content .= "</entry>";

concatenation
$content .= "code";
$content .= "code";
$content .= "code";
Creates one logical line,
missing semi-colon after </issued>" creates a second line, and a syntax error

Ok, I use this;

$content = '<' . '?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?' . '>';
$content .= "<entry xmlns='http://purl.org/atom/ns#'>";
$content .= "<title mode='escaped' type='text/plain'>".$title."</title>";
$content .= "<issued>".$issued."</issued>";
$content .= "<generator url='http://www.yoursitesurlhere.com'>client's name</generator>";
$content .= "<content type='application/xhtml+xml'>";
$content .= "<div xmlns='http://www.w3.org/1999/xhtml'>".$body."</div>";
$content .= "</content>";
$content .= "</entry>";

But now it gives error at the first line of this code...

i tried this:

$content = '<?xml version="1.0" encoding="utf-8" standalone="yes"?>';
      $content .= "<entry xmlns='http://purl.org/atom/ns#'>";
      $content .= "<title mode='escaped' type='text/plain'>".$title."</title>";
      $content .= "<issued>".$issued."</issued>";
      $content .= "<generator url='http://www.yoursitesurlhere.com'>client's name</generator>";
      $content .= "<content type='application/xhtml+xml'>";
      $content .= "<div xmlns='http://www.w3.org/1999/xhtml'>".$body."</div>";
      $content .= "</content>";
      $content .= "</entry>";

and there were no errors on my server.

Really thanks, but now I get this error

Parse error: syntax error, unexpected T_DNUMBER at line 25 :(

My full code is this

<?php
/*
Script by CasTex
*/

// post tarihi
$issued=gmdate("Y-m-d\TH:i:s\Z", time());

// post title kısmı
$title="bakalim oliyir mii";

// postun body kısmı
$body="yaz buraya bişiler ne bilim ben.";

// blogid sini yaz
$blog_id="7421378769979406050";

// kullanici adi ve parola
$your_username="xxx";  //change this to your blogger login username
$your_password="xxx;  // change this to your blogger login password

$soru = "?";

// bloga yollanacak xml data
      $content = '<?xml version="1.0" encoding="utf-8" standalone="yes"?>';
      $content .= "<entry xmlns='http://purl.org/atom/ns#'>";
      $content .= "<title mode='escaped' type='text/plain'>".$title."</title>";
      $content .= "<issued>".$issued."</issued>";
      $content .= "<generator url='http://www.yoursitesurlhere.com'>client's name</generator>";
      $content .= "<content type='application/xhtml+xml'>";
      $content .= "<div xmlns='http://www.w3.org/1999/xhtml'>".$body."</div>";
      $content .= "</content>";
      $content .= "</entry>";

// bloga yollancak header
$headers  =  array( "Content-type: application/atom+xml" );

// Use curl to post to your blog.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://www.blogger.com/atom/".$blog_id);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 4);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_USERPWD, $your_username.':'.$your_password);
curl_setopt($ch, CURLOPT_POSTFIELDS, $content);

$data = curl_exec($ch);

if (curl_errno($ch)) {
 print curl_error($ch);
} else {
 curl_close($ch);
}

// sonucu bas
echo $data;

?>

you are missing a quotation on this line:

$your_password="xxx;  // change this to your blogger login password

You must change your code on line 25 like this:

$content = "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>";

My suggestion is to ditch whatever editor you are using, and set up an editor with code highlighting
the missing quotes, semicolons and other syntax errors would then be highlighted while you are editing.