Try to debug API, find where did the connection failed

.idea/php.xml

@@ -1,4 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="MessDetectorOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PHPCSFixerOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PHPCodeSnifferOptionsConfiguration">
+    <option name="highlightLevel" value="WARNING" />
+    <option name="transferred" value="true" />
+  </component>
   <component name="PhpProjectSharedConfiguration" php_language_level="8.1" />
+  <component name="PhpStanOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
+  <component name="PsalmOptionsConfiguration">
+    <option name="transferred" value="true" />
+  </component>
 </project>

Source/API/script/Config/ConnectClass.php

@@ -21,9 +21,9 @@ class ConnectClass{
     function connect(): int|Connection
     {
         try {
-            echo "OKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK";
+            echo $this->dsn."  ".$this->login."   ".$this->password;
             $connection = new Connection($this->dsn,$this->login,$this->password);
-
+            echo "OKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK";
         }catch (PDOException){
             throw new PDOException();
         }

Source/API/script/Gateway/GatewayForm.php

@@ -14,8 +14,8 @@ class GatewayForm
     public function __construct()
     {
         try{
-            echo "ici???";
             $this->connection = (new ConnectClass)->connect();
+            echo "ici???";
         }catch(PDOException){
             throw new PDOException();
         }