sqlsrv_send_stream_data

<?php
$serverName = "serverName\sqlexpress";
$connectionInfo = array( "Database"=>"dbName", "UID"=>"username", "PWD"=>"password" );
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn === false ) {
     die( print_r( sqlsrv_errors(), true));
}

$sql = "UPDATE Table_1 SET data = ( ?) WHERE id = 100";

// Open parameter data as a stream and put it in the $params array.
$data = fopen( "data://text/plain,[ Lengthy content here. ]", "r");
$params = array( &$data);

// Prepare the statement. Use the $options array to turn off the
// default behavior, which is to send all stream data at the time of query
// execution.
$options = array("SendStreamParamsAtExec"=>0);
$stmt = sqlsrv_prepare( $conn, $sql, $params, $options);

sqlsrv_execute( $stmt);

// Send up to 8K of parameter data to the server 
// with each call to sqlsrv_send_stream_data.
$i = 1;
while( sqlsrv_send_stream_data( $stmt)) {
      $i++;
}
echo "$i calls were made.";
?>