Fix usuarios module: resolve PHP 8 warnings and fatal errors

- Fixed undefined array key warnings in usuarios-agregar.php
- Fixed undefined variable warnings (, , )
- Fixed null array offset warnings in db.class.php GetSingle()
- Added default parameter to ValidateMail() in util.class.php
- Fixed PrintErrors() return value for proper error handling
- Fixed integer constraint errors for codigoPostal and sucursalId
- Added missing identificacion and comprobante fields to INSERT query
- Fixed undefined  variable in IsEmailTaked()

classes/db.class.php

@@ -205,11 +205,9 @@ public function DatabaseConnect()
         } else {
             $row = mysqli_fetch_array($this->sqlResult);
         }
-		$rs = $row[0];
 
-		if(!$rs)
-			$rs = 0;
-			
+		$rs = ($row && isset($row[0])) ? $row[0] : 0;
+
     $this->CleanQuery();
 
     return $rs;

classes/usuario.class.php

@@ -117,7 +117,7 @@ class Usuario extends Main
 	public function setCodigoPostal($value)
 	{
 		$this->Util()->ValidateString($value, $max_chars=50, $minChars = 0, "Codigo Postal");
-		$this->codigoPostal = $value;
+		$this->codigoPostal = empty($value) ? 0 : $value;
 	}
 		  
 	public function setTelefono($value)
@@ -156,10 +156,10 @@ class Usuario extends Main
 		$this->tipo = $value;
 	}
         
-    public function setSucursalId($value)
+	public function setSucursalId($value)
 	{
 		$this->Util()->ValidateString($value, $max_chars=300, $minChars = 0, 'Sucursal');
-		$this->sucursalId = $value;
+		$this->sucursalId = empty($value) ? 0 : $value;
 	}
         
     public function setEmail($value)
@@ -227,40 +227,45 @@ class Usuario extends Main
 		
 	public function Save()
 	{
-		if($this->Util()->PrintErrors()){ 
-			return false; 		
+		if($this->Util()->PrintErrors()){
+			return false;
 		}
-		
+
+		$identificacion = isset($this->identificacion) ? $this->identificacion : '';
+		$comprobante = isset($this->comprobante) ? $this->comprobante : '';
+
 		$db = new DB(true);
 		$db->setQuery("
-			INSERT INTO usuario ( 
+			INSERT INTO usuario (
 				empresaId,
 				nombre,
-				apellidos,				
+				apellidos,
 				calle,
-				noInt, 
-				noExt, 
-				referencia, 
-				colonia, 
-				localidad, 
-				municipio, 
+				noInt,
+				noExt,
+				referencia,
+				colonia,
+				localidad,
+				municipio,
 				estado,
-				pais, 
+				pais,
 				codigoPostal,
 				telefono,
 				celular,
 				noImss,
 				curp,
 				rfc,
-				email, 
-				password, 
+				identificacion,
+				comprobante,
+				email,
+				password,
 				`type`,
-                sucursalId
-			) 
+				sucursalId
+			)
 			VALUES (
 				'".$_SESSION["empresaId"]."',
 				'".$this->nombre."',
-				'".$this->apellidos."',				
+				'".$this->apellidos."',
 				'".$this->calle."',
 				'".$this->noInt."',
 				'".$this->noExt."',
@@ -276,11 +281,12 @@ class Usuario extends Main
 				'".$this->noImss."',
 				'".$this->curp."',
 				'".$this->rfc."',
+				'".$identificacion."',
+				'".$comprobante."',
 				'".$this->email."',
 				'".$this->passwd."',
 				'".$this->tipo."',
-                '".$this->sucursalId."')"
-			);		
+				'".$this->sucursalId."')");		
 		$usuarioId = $db->InsertData();
 		
 		$this->Util()->setError(20017, "complete");
@@ -494,10 +500,12 @@ class Usuario extends Main
 	}
 	
 	function IsEmailTaked(){
-		
+
+		$sqlAdd = '';
+
 		if($this->usuarioId)
 			$sqlAdd = ' AND usuarioId <> "'.$this->usuarioId.'"';
-		
+
 		$sql = 'SELECT usuarioId FROM usuario
 				WHERE email = "'.$this->email.'"
 				'.$sqlAdd.'

classes/util.class.php

@@ -168,15 +168,15 @@ class Util extends SystemError
 			return true;
 		}
 	}//ValidateFloat
-	
-	function ValidateMail($mail, $field)
+
+	function ValidateMail($mail, $field = 'Email')
 	{
 		$mail = strtolower($mail);
 		if (!preg_match('/^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+)+$/',trim($mail)))
 		{
 			return $this->setError(10002, "error", "", $field);
 		}
-	}	
+	}
 
 	function ValidateUrl($url)
 	{
@@ -477,12 +477,16 @@ class Util extends SystemError
 	
 	function PrintErrors()
 	{
+		if(empty($this->error)){
+			return false;
+		}
+
 		$errorStr = "<div id='error-box'>";
 		foreach($this->error as $key => $val)
 		{
 			$msg = $this->errorMessage($val);
-			$field = $this->errorField[$key];
-			
+			$field = isset($this->errorField[$key]) ? $this->errorField[$key] : '';
+
 			$errorStr .= "<div class='error-item'>";
 			if($field != "")
 			{
@@ -493,6 +497,7 @@ class Util extends SystemError
 		}
 		$errorStr .= "</div>";
 		echo $errorStr;
+		return true;
 	}
 	
 	function errorMessage($code)