How to check SQL script PHP code error

How to check SQL script PHP code error, which we able to use echo to do this advantage.
instance:
echo $sql;

PHP database list box

PHP code how to create list box from database value

Free Build new form or Template

Best free template builder here
http://www.phpform.org/

Limitation of header clause in PHP

Example:
...
if(a=b)
{
...
}
else
{
...
header("Location: admin_home.php");
}
?>

header need located at last clause of php code:
must not have space and other command

php where Clause

Pattern:
SELECT column_name(s)
FROM table_name
WHERE column_name operator value

PHP code Example:
$myquery= mysql_query("SELECT * FROM Persons
WHERE FirstName='John' ");

$result=mysql_query($myquery);
if(!$result)
{
$error = "Query fail!";
return($error);
}

Where Clause with variable
$myquery ="select * from userdb where user = '".$myuser."' and usepw= '".$mepw."' ";

this clause specific 2 variables those are:

$myuser => ' " .$myuser. " '

$mepw => ' " .$mepw. " '

Please Note: ' " .$myuser. " ' => must no space => should be '".$myuser."'

PHP Correct Web Date time

PHP code fix problem regarding time not correct
$metime = date("Y-m-d H:i:s", strtotime("+5 hours"));

PHP Check Server Time Zone
echo date_default_timezone_get();;

Cheap Web Host

Almost cheap host would provide us for Linux server, which those web host would give user free service for PHP and MySQL database.
Mention to those solution would give user got cheapest web hosting, so we need to learn more regarding PHP programing , MySQL scrip.
PHP is free scrip, which we able to build by editor program instance to Edit plus or Notepad.
Also for visual PHP programing instance Delphi PHP or Dreamweaver.
Delphi PHP most flexible for PHP coding.
Mention to Delphi PHP programing tip please follow link at right side.