pdo_odbc returns a maximum of 4096 characters when executing the SqlServer 2000 stored procedure. How to solve it?

Environment: win10 SqlServer2000 php5.5 yii2.0.7
Problem: After executing the stored procedure readAll(), a single line and single field can return up to 4096 characters, while the stored procedure definition is 8000 characters, resulting in incomplete display.
Code:

<code>$sp_sql = "EXEC {$sp_name} ";
$sp_command = $this->db->createCommand($sp_sql);
$stmt = $sp_command->query();
$rowset = $stmt->readAll();
var_dump($rowset);</code>

Return:

<code>array(1) { [0]=> array(1) { ["json"]=> string(4096) "{"RowCount":"56","Data":    
</code>

Tried method (no results): It seems that the odbc here is not valid for the PDO method.

<code>php.ini里面配置
odbc.defaultlrl = 4096
</code>

Reference materials (no results):
http://www.cnblogs.com/longhs/p/3628315.html

Reply content:

Environment: win10 SqlServer2000 php5.5 yii2.0.7
Problem: After executing the stored procedure readAll(), a single line and single field can return up to 4096 characters, while the stored procedure definition is 8000 characters, resulting in incomplete display.
Code:

<code>$sp_sql = "EXEC {$sp_name} ";
$sp_command = $this->db->createCommand($sp_sql);
$stmt = $sp_command->query();
$rowset = $stmt->readAll();
var_dump($rowset);</code>

Return:

<code>array(1) { [0]=> array(1) { ["json"]=> string(4096) "{"RowCount":"56","Data":    
</code>

Tried method (no results): It seems that the odbc here is not valid for the PDO method.

<code>php.ini里面配置
odbc.defaultlrl = 4096
</code>

Reference materials (no results):
http://www.cnblogs.com/longhs/p/3628315.html