php - sql/php syntax error, unexpected T_ENCAPSED_AND_WHITESPACE, expecting

Question

I got error on line 16 in myphp page which is;

$result = mysql_query("update Users set lat='$lat',lon='$lng' where username=$_SESSION['username']");

Answer 1

You need curly braces {} inside of the string to return array parts:

$result = mysql_query("update Users set lat='$lat',lon='$lng' where username={$_SESSION['username']}");

Note: As has already been mentioned, you shouldn't be using mysql_query.

Answer 2

Although mysql_* functions are being deprecated here is the error on your query:

$result = mysql_query("update Users set lat='$lat',lon='$lng' where username=".$_SESSION['username']);

Also make sure your inputs are sanitized before being used in your query:

Answer 3

You lost track of all needed ' and additionally forgot to quote username value. So instead of

$result = mysql_query("update Users set lat='$lat',lon='$lng' where username=$_SESSION['username']");

do this in more clean manner:

$result = mysql_query( "update Users set lat='$lat',lon='$lng' where username='" . $_SESSION['username'] . "'");

or even better:

$query = sprintf("update Users set lat='%s',lon='%s' where username=%s"), 
         $lat, $lng, $_SESSION['username']);
$result = mysql_query($query);

BTW: switch to MYSQLi or PDO as MYSQL extension is deprecated, no new code should touch it.

Answer 4

You have multiple problems, but the error relates to variable expansion with your double quoted string.

Error:

echo "$_SESSION['username']";

No Error:

echo "{$_SESSION['username']}";

Alternatives:

echo "..." . $_SESSION['username'] . "...";
echo '...' . $_SESSION['username'] . '...';

Read the documentation on Strings to determine how you want do handle variable expansion in strings.

I'd also recommend reading about SQL Injection and PDO.