PHP aes （ecb）解密后乱码问题

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function apiDataDecrypt($data, $key='') {

$data = base64_decode($data);

$pad = 16 - (strlen($data) % 16);

$padData = $data . str_repeat(chr($pad), $pad);

return mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key,$padData, MCRYPT_MODE_ECB);

}

}

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$key = '1234567890123456';

$content = 'T7UT2NQ1AFvR9unjA0wKWA==';

$desStr = decryptString($content,$key);

echo($desStr);

function decryptString($str,$key) {

$str = base64_decode($str);

$str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $str, MCRYPT_MODE_ECB);

$block = mcrypt_get_block_size('rijndael_128', 'ecb');

$pad = ord($str[($len = strlen($str)) - 1]);

$len = strlen($str);

$pad = ord($str[$len-1]);

return substr($str, 0, strlen($str) - $pad);

}