Description:
------------
I'm running PHP 5.6.5 x64 nts on Windows Server 2012, 64bit, fastcgi.

When I execute odbc_exec from a table with ntext field, selecting the ntext field, PHP crashes my script with the following error:

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate
 1073741824 bytes) in C:\Users\username1\Desktop\odbc_exec_crash_test.php on line 16

The same problem persists with almost all previous versions available on the download site, both 32 and 64 bits, non-thread-safe:
 php 5.6.5 i386 nts
 php 5.5.21 x64 nts
 php 5.4.37 i386 nts


Test script:
---------------
<?php
	$dbloc_dsn_srv = "DRIVER={SQL Server Native Client 11.0};Server=MYSERVER\MYINSTANCE".
		";ExtendedAnsiSQL=1;Database=mydb;UID=userweb1;PWD=pwdweb";
	$cn = odbc_pconnect($dbloc_dsn_srv,"","")
			or die("Error connecting to DB\n".odbc_errormsg());
			
	print "PHP version ".phpversion()."\n";
	
	$qry = "IF OBJECT_ID('test1', 'U') IS NOT NULL DROP TABLE test1";
	$res = odbc_exec($cn,$qry) or die("Drop query error: $qry\n");
	
	$qry = "CREATE TABLE test1 ( id integer not null, field ntext default '' not null, primary key(id))";
	$res = odbc_exec($cn,$qry) or die("Query error: $qry\n");
	
	$qry = "SELECT field from test1";
	$res = odbc_exec($cn,$qry) or die("Query error: $qry\n");
	while( $row = odbc_fetch_object($res) ) {
		print $row->field."\n";
	}

	print "Done without errors\n";
?>


Expected result:
----------------
PHP version 5.6.5

Done without errors


Actual result:
--------------
PHP version 5.6.5

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 1073741824 bytes) in C:\Users\username1\Desktop\odbc_exec_crash_test.php on line 16