mysql - Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' in Undefined class constant (PHP 5.5.3) -

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i have config file connects remote database, keep receiving error don't know how fix. in earlier versions meant bug assumed have been fixed 5.5.3.

<?php error_reporting(e_all); ini_set('display_errors', 'on');  $host = "localhost"; $dbname = "registration"; $username = "databaseeditor"; $password = "yolo10";  // 1002 = mysql_attr_init_command $options = array(pdo::mysql_attr_init_command => 'set names utf8');  try {     $db = new pdo("mysql:host={$host};dbname={$dbname};charset=utf8", $username$ } catch(pdoexception $ex) {     die("failed connect database: " . $ex->getmessage()); }  $db->setattribute(pdo::attr_errmode, pdo::errmode_exception);  $db->setattribute(pdo::attr_default_fetch_mode, pdo::fetch_assoc);  header('content-type: text/html; charset=utf-8');  echo "file works"; ?>

i keep receiving error "undefined class constant 'mysql_attr_init_command'". have tried use 1002 instead of 'mysql_attr_init_command' end error "syntax error, unexpected '1002' (t_lnumber)" instead , have have installed newest php-mysql extension.

try editing php.ini:

on windows server can add following lines in php.ini 

 extension=php_pdo.dll  extension=php_pdo_mysql.dll

on linux server can compile php following option --with-pdo-mysql

in php.ini, add following lines 

 extension=pdo.so  extension=pdo_mysql.so

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