Linux, Apache, MySQL, PHP

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if (!isset($inactiv)) $inactiv = 0;
else $inactiv = my_time()-$inactiv*2592000;

PHP Fatal error:  Uncaught TypeError: Unsupported operand types: string * int

Hello, I get this error when updating or editing data in a "name" field, I leave this error in more detail: Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\pdo\conectar.php:46 Stack trace: #0 C:\xampp\htdocs\pdo\editar.php(20): Datos->setDatos('update candidat...') #1 {main} thrown in C:\xampp\htdocs\pdo\conectar.php on line 46

<?php
class Conectar{
private $conn;
public function conectar(){
try{
$this->conn = new PDO("mysql:dbname=sistema\_votos;host=localhost", "root", "");
} catch(PDOException $error){
die("Error: ".$error);
}
return $this->conn;
}
public function setNames(){
return $this->conn->query("SET NAMES 'utf8'");
}
}
class Datos extends Conectar{
private $bd;
public function \_\_construct(){
$this->bd = self::conectar();
self::setNames();
}
public function getDatos($sql){
$datos = $this->bd->prepare($sql);
if (!$datos) {
echo "\\nPDO::errorInfo():\\n";
print\_r($this->bd->errorInfo());
die();
}
$datos->execute();
$this->bd=null;
return $datos->fetchAll();
}
public function getDato($sql){
$datos = $this->bd->prepare($sql);
$datos->execute();
$this->bd=null;
return $datos->fetch();
}
public function setDatos($sql){
$datos = $this->bd->prepare($sql);
$datos->execute();
//return $this->bd->lastInsertId();
}
}

conectar.php:

<?php
class Conectar{
private $conn;
public function conectar(){
try{
$this->conn = new PDO("mysql:dbname=sistema\_votos;host=localhost", "root", "");
} catch(PDOException $error){
die("Error: ".$error);
}
return $this->conn;
}
public function setNames(){
return $this->conn->query("SET NAMES 'utf8'");
}
}
class Datos extends Conectar{
private $bd;
public function \_\_construct(){
$this->bd = self::conectar();
self::setNames();
}
public function getDatos($sql){
$datos = $this->bd->prepare($sql);
if (!$datos) {
echo "\\nPDO::errorInfo():\\n";
print\_r($this->bd->errorInfo());
die();
}
$datos->execute();
$this->bd=null;
return $datos->fetchAll();
}
public function getDato($sql){
$datos = $this->bd->prepare($sql);
$datos->execute();
$this->bd=null;
return $datos->fetch();
}
public function setDatos($sql){
$datos = $this->bd->prepare($sql);
$datos->execute();
//return $this->bd->lastInsertId();
}
}

I'm desperate, because I can't find the solution, add that I've tested the connection and with respect to that everything works fine, so it's not a connection problem.

RewriteEngine on
RewriteCond %{QUERY_STRING} ^/?smp=([0-9]+)$ [NC]
RewriteRule ^$ https://www.example.com/?p=$ [R=301,L]

PHP Warning: Attempt to read property "post_content" on null in /some-path/wp-content/themes/boldr-lite/functions.php on line 267

PHP Warning: Attempt to read property "post_content" on null in /some-path/wp-content/themes/boldr-lite/functions.php on line 268

preg_match( '/<!--more(.*?)?-->/', $post->post_content )

|| preg_match( '/<!--nextpage-->/', $post->post_content )

/*
 * Rewrite and replace wp_trim_excerpt() so it adds a relevant read more link
 * when the <!--more--> or <!--nextpage--> quicktags are used
 * This new function preserves every features and filters from the original wp_trim_excerpt
 */
function boldr_trim_excerpt( $text = '' ) {
	global $post;
	$raw_excerpt = $text;
	if ( '' === $text ) {
		$text = get_the_content( '' );
		$text = strip_shortcodes( $text );
		$text = apply_filters( 'the_content', $text );
		$text = str_replace( ']]>', ']]>', $text );
		$excerpt_length = apply_filters( 'excerpt_length', 55 );
		$excerpt_more = apply_filters( 'excerpt_more', ' [...]' );
		$text = wp_trim_words( $text, $excerpt_length, $excerpt_more );

		/* If the post_content contains a <!--more--> OR a <!--nextpage--> quicktag
		 * AND the more link has not been added already
		 * then we add it now
		 */
		if (
			(
				preg_match( '/<!--more(.*?)?-->/', $post->post_content )
				|| preg_match( '/<!--nextpage-->/', $post->post_content )
			)
			&& strpos( $text, $excerpt_more ) === false
		) :
			$text .= $excerpt_more;
		endif;

	}
	return apply_filters( 'boldr_trim_excerpt', $text, $raw_excerpt );
}
remove_filter( 'get_the_excerpt', 'wp_trim_excerpt' );
add_filter( 'get_the_excerpt', 'boldr_trim_excerpt' );

<?php 
        if(isset($_GET['id']) && $_GET['id'] != "")
		{
			 $query = "SELECT * FROM ".C_MYSQL_MESSAGES." WHERE (sender_id =".$_SESSION['m']." AND receiver_id=". (int)$_GET['id'].") OR (sender_id =".(int)$_GET['id']." AND receiver_id=".$_SESSION['m'].") ORDER BY `date_added` ASC";
			 $result = mysqli_query($conn,$query) or die();
			 
		     while($j = mysqli_fetch_array($result))
			{
				$c = mysqli_query($conn,"UPDATE ".C_MYSQL_MESSAGES." SET status=1 WHERE id=".$j['id']);
				
				$class = "";
				$date_class = "";
				if($j['sender_id'] == $_SESSION['m'])
				{
					$class = "right";
					$date_class = "date_left";
				}
				else
				{
					$class = "left";
					$date_class = "date_right";
				}
					
				echo '<p class="msgtext '.$class.'">'.$j['date_added'].''.$j['message'].'</p>';	
			}
		}
   
  ?>

PHP Fatal error:  Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'm ok brother
')' at line 1 in send_message.php:9

<?php
include_once 'include/config.inc.php';
include_once 'include/options.inc.php';
include_once 'include/security.inc.php';
include_once 'include/functions.inc.php';
include_once 'templates/'.C_TEMP.'/config.php';
 if( isset($_POST['message']) && isset($_POST['sender_id']) && isset($_POST['receiver_id']) && $_POST['message'] != "" && $_POST['sender_id'] != "" && $_POST['receiver_id'] != "")
 {
	mysqli_query($conn,"INSERT INTO ".C_MYSQL_MESSAGES."(`sender_id`,`receiver_id`,`message`) VALUES (".$_POST['sender_id'].",".$_POST['receiver_id'].",'".$_POST['message']."')");
	
	echo 1;
 }
 else
 {   
    echo 0;
 }
 ?>