PHP search all mysql tables

mysql-search.php

<?php
function findAll($search_str, $database, $types = ['tinytext','blob','varchar','text','longblob']){
    global $pdo;

    foreach($types as &$t){
        $t = "'" . $t . "'";
    }
    $types = implode(',',$types);

    $s = $pdo->prepare("
      SELECT TABLE_NAME, COLUMN_NAME
      FROM INFORMATION_SCHEMA.columns 
      WHERE 
        TABLE_SCHEMA = :database
        AND DATA_TYPE IN ($types)
    ");
    $s->bindValue(':database', $database);
    $s->execute();
    $results = [];

    foreach($s->fetchAll(\PDO::FETCH_ASSOC) as $column){
        $search = $pdo->prepare("SELECT * FROM $database.${column['TABLE_NAME']} WHERE ${column['COLUMN_NAME']} LIKE :search_str");
        $search->bindValue(':search_str', $search_str);
        $search->execute();

        $result = $search->fetchAll(\PDO::FETCH_ASSOC);

        if(count($result))
            $results[$column['TABLE_NAME']] = isset($results[$column['TABLE_NAME']])
                ? array_merge(
                    $results[$column['TABLE_NAME']],
                    $result
                )
                : $result;

    }
    return $results;
}