PDO sqlsrv: right trimming on LIKE on char fields - php

Question

I noticed that if you open a connection with PDO :: SQLSRV_ATTR_ENCODING = PDO :: SQLSRV_ENCODING_UTF8 (default configuration) there is a problem when using LIKE with named parameters on char fields.
No automatic trim of the padding spaces is performed, an operation that is performed in all other cases.
How to reproduce the problem:
Create a table and insert data in it:
CREATE TABLE testDB.dbo.TEST_TABLE (
ID_FIELD int IDENTITY(1,1) NOT NULL,
CHAR_FIELD char(15) COLLATE Latin1_General_CI_AS DEFAULT ' ' NOT NULL
CONSTRAINT TEST_TABLEK00 PRIMARY KEY (ID_FIELD)
);
INSERT INTO TEST_TABLE (CHAR_FIELD) VALUES ('Test data'), ('MyString'), ('My data 123');
Then on PHP I get this results
$options = array();
$pdo = new PDO("sqlsrv:Server=testServer;Database=testDB", 'test', 'test', $options);
$stmt = $pdo->prepare("SELECT * FROM TEST_TABLE WHERE CHAR_FIELD = 'Test data'");
$stmt->execute();
$results = $stmt->fetchAll(); //Returns 1 row
$stmt = $pdo->prepare("SELECT * FROM TEST_TABLE WHERE CHAR_FIELD LIKE 'Test data'");
$stmt->execute();
$results = $stmt->fetchAll(); //Returns 1 row
$stmt = $pdo->prepare("SELECT * FROM TEST_TABLE WHERE CHAR_FIELD = :CHAR_FIELD");
$value = 'Test data';
$stmt->bindParam('CHAR_FIELD', $value, PDO::PARAM_STR);
$stmt->execute();
$results = $stmt->fetchAll(); //Returns 1 row
$stmt = $pdo->prepare("SELECT * FROM TEST_TABLE WHERE CHAR_FIELD LIKE :CHAR_FIELD");
$value = 'Test data';
$stmt->bindParam('CHAR_FIELD', $value, PDO::PARAM_STR);
$stmt->execute();
$results = $stmt->fetchAll(); //Returns 0 rows
$stmt = $pdo->prepare("SELECT * FROM TEST_TABLE WHERE CHAR_FIELD LIKE :CHAR_FIELD");
$value = 'Test data ';
$stmt->bindParam('CHAR_FIELD', $value, PDO::PARAM_STR);
$stmt->execute();
$results = $stmt->fetchAll(); //Returns 1 row
$options = array(PDO::SQLSRV_ATTR_ENCODING => PDO::SQLSRV_ENCODING_SYSTEM);
$pdo = new PDO("sqlsrv:Server=testServer;Database=testDB", 'test', 'test', $options);
$stmt = $pdo->prepare("SELECT * FROM TEST_TABLE WHERE CHAR_FIELD LIKE :CHAR_FIELD");
$value = 'Test data';
$stmt->bindParam('CHAR_FIELD', $value, PDO::PARAM_STR);
$stmt->execute();
$results = $stmt->fetchAll(); //Returns 1 row
The behavior of the like together with the named parameter, when opening the connection to the DB in UTF8, is not uniform with all the other behaviors.
Only in that case is the field not automatically trimmed while in all other cases it is. Personally, it seems to me more of a bug than a deliberate behavior.
I find myself managing a huge application, developed over 10 years and which can interface with different databases (mysql, postgres, oracle and sqlserver).
Changing the queries one by one is impossible, I would need a solution at the configuration level (some flags to set in the PDO or on SqlSever itself) or at least find a way to normalize this behavior to all the others automatically via code.