<?php

const USER = 'test';
const PASS = 'test';

try {

    $dbh = new PDO('mysql:host=localhost;dbname=test', USER, PASS, [
    	PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    ]);

    $sql  = '';
    $sql .= "SELECT * FROM demo WHERE 1=1 ";
    $sql .= "AND hint LIKE :f1 ESCAPE '/' ";
    $sql .= "OR hint LIKE :f2 ESCAPE '/' ";

    $sth = $dbh->prepare($sql);
    $sth->bindValue(':f1', '2XXXX4/_%');
    $sth->bindValue(':f2', '%/_2XXXX4/_%');
    $sth->execute();

    $result = $sth->fetchAll();
	echo "<pre>" .print_r($result, true). "</pre>";

    $dbh = null;
} catch (PDOException $e) {
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
}