MCrypt rijndael-128 to OpenSSL aes-128-ecb conversion

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Here is what worked for me:

<?php

$str="Content";
if (strlen($str) % 16) {
    $str = str_pad($str, strlen($str) + 16 - strlen($str) % 16, "\0");
}

$key = 'KEY';
if (strlen($key) % 16) {
    $key = str_pad($key, strlen($key) + 16 - strlen($key) % 16, "\0");
}

$res1 = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_ECB);
echo strToHex($res1) . ' | mcrypt_encrypt';

echo "<hr>";
echo strToHex(openssl_decrypt($res1, "aes-128-ecb", $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING)) . ' | openssl_decrypt';

echo "<hr>";

$res2 = openssl_encrypt($str, "aes-128-ecb", $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING);
echo strToHex($res2) . ' | openssl_encrypt';

echo "<hr>";
echo strToHex(openssl_decrypt($res2, "aes-128-ecb", $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING)) . ' | openssl_decrypt';


function strToHex($string) {
    $hex = '';
    for ($i = 0; $i < strlen($string); $i++) {
        $ord     = ord($string[$i]);
        $hexCode = dechex($ord);
        $hex     .= substr('0' . $hexCode, -2);
    }

    return strToUpper($hex);
}

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