Installing/Configuring
PHP Manual

Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

MS SQL Server configuration options
Name Default Changeable Changelog
mssql.allow_persistent "1" PHP_INI_SYSTEM  
mssql.max_persistent "-1" PHP_INI_SYSTEM  
mssql.max_links "-1" PHP_INI_SYSTEM  
mssql.min_error_severity "10" PHP_INI_ALL  
mssql.min_message_severity "10" PHP_INI_ALL  
mssql.compatability_mode "0" PHP_INI_ALL  
mssql.connect_timeout "5" PHP_INI_ALL  
mssql.timeout "60" PHP_INI_ALL Available since PHP 4.1.0.
mssql.textsize "-1" PHP_INI_ALL  
mssql.textlimit "-1" PHP_INI_ALL  
mssql.batchsize "0" PHP_INI_ALL Available since PHP 4.0.4.
mssql.datetimeconvert "1" PHP_INI_ALL Available since PHP 4.2.0.
mssql.secure_connection "0" PHP_INI_SYSTEM Available since PHP 4.3.0.
mssql.max_procs "-1" PHP_INI_ALL Available since PHP 4.3.0.
mssql.charset "" PHP_INI_ALL Available since PHP 5.1.2 when built with FreeTDS 7.0 or greater.
For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.