A singleton pattern me that a class can have only one instance object.
function_exists()
Use PDO prepared statements and parameterized queries: for example: $input= $_POST["user-input"] $stmt = $pdo->prepare('INSERT INTO table (column) VALUES (":input"); $stmt->execute(array(':input' => $input));
As PHP is a scripting language, HTML and PHP cannot be separated.
session_register() is used to maintain the value of a variable over different pages.
Yes,PHP 5 supports Exceptions.
$arr[$newkey] = $arr[$oldkey]; unset($arr[$oldkey]);
session_start();
__call,__get,__set
multipart/form-data
memory_limit = 128M
mail ($to, $subject, $message,$headers)
set_error_handler('error_handler');
mail($to,$subject,$body)
The PHP program will stop executing at the point where the error occurred.
internal $term = 3;
if (session_id()) echo 'session started';
Mysqli can only be used to access MySQL database while PDO can be used to access any DBMS.
var_dump($e->getTraceAsString());
Yes. We can use gettext in PHP.