<?php 
$pdo = new PDO('mysql:dbname=information_schema;host=127.0.0.1','user','pass');
$dbs = $pdo->query("SELECT SCHEMA_NAME FROM SCHEMATA")->fetchAll(\PDO::FETCH_OBJ);
$system_dbs = ['mysql', 'information_schema', 'performance_schema', 'sys'];
foreach($dbs as $db) {
    if(in_array($db->SCHEMA_NAME, $system_dbs))
        continue;
    $pdo->exec("USE " . $db->SCHEMA_NAME);
    $pdo->exec("TRUNCATE TABLE tablo_adi");
}