Updated pdo_sqlsrv_get_driver_methods as per documentation (#1259)

source/pdo_sqlsrv/pdo_dbh.cpp

@@ -1574,12 +1574,13 @@ pdo_sqlsrv_function_entry *pdo_sqlsrv_get_driver_methods( _Inout_ pdo_dbh_t *dbh
     PDO_LOG_DBH_ENTRY;
 
     sqlsrv_conn* driver_conn = reinterpret_cast<sqlsrv_conn*>( dbh->driver_data );
-    SQLSRV_ASSERT( driver_conn != NULL, "pdo_sqlsrv_get_driver_methods: driver_data object was NULL." );
-    CHECK_CUSTOM_ERROR( true, driver_conn, PDO_SQLSRV_ERROR_FUNCTION_NOT_IMPLEMENTED ) {
-        return NULL;
-    }
 
-    return NULL;    // to avoid a compiler warning
+    // As per documentation, simply return false if the method does not exist
+    // https://www.php.net/manual/en/function.is-callable.php
+    // But user can call PDO::errorInfo() to check the error message if necessary
+    CHECK_CUSTOM_WARNING_AS_ERROR(true, driver_conn, PDO_SQLSRV_ERROR_FUNCTION_NOT_IMPLEMENTED);
+
+    return NULL;    // return NULL for PDO to take care of the rest
 }
 
 namespace {

test/functional/pdo_sqlsrv/pdo_1258_is_callable_error.phpt

@@ -0,0 +1,50 @@
+--TEST--
+GitHub issue 1258 - is_callable() throws an exception if PDOStatement method does not exist
+--DESCRIPTION--
+The test shows is_callable() will return false if PDOStatement method does not exist instead of throwing an exception. The user can still check errorInfo() for the error message. See documentation https://www.php.net/manual/en/function.is-callable.php
+--ENV--
+PHPT_EXEC=true
+--SKIPIF--
+<?php require('skipif.inc'); ?>
+--FILE--
+<?php
+require_once("MsSetup.inc");
+require_once("MsCommon_mid-refactor.inc");
+
+try {
+    $conn = connect();
+    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+    $stmt = $conn->prepare("SELECT @@Version");
+    $functionExists = is_callable([$stmt, 'bindParam'], false, $callable);
+    var_dump($functionExists);
+    var_dump($callable);
+
+    $functionExists = is_callable([$stmt, 'boo']);
+    var_dump($functionExists);
+    
+    echo PHP_EOL . "Error INFO:" . PHP_EOL;
+    var_dump($conn->errorInfo());
+
+    echo "Done\n";
+} catch (PdoException $e) {
+    echo $e->getMessage();
+}
+
+?>
+--EXPECT--
+bool(true)
+string(23) "PDOStatement::bindParam"
+bool(false)
+
+Error INFO:
+array(3) {
+  [0]=>
+  string(5) "IMSSP"
+  [1]=>
+  int(-58)
+  [2]=>
+  string(48) "This function is not implemented by this driver."
+}
+Done
+