php aes/cbc/pkcs5padding encrypt/decrypt

class MagicCrypt
{
    // 密钥偏移量IV，可自定义
    private $iv = '';

    // AES-key，可自定义
    private $encryptKey = '';

    public function __construct($encryptKey, $iv)
    {
        $this->encryptKey = $encryptKey;
        $this->iv = $iv;
    }

    /**
     * 加密
     * @param string $encryptStr
     * @return string
     */
    public function encrypt($encryptStr)
    {
        $localIV = $this->iv;
        $encryptKey = $this->encryptKey;

        // open module
        $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);

        mcrypt_generic_init($module, $encryptKey, $localIV);

        // padding
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $pad = $block - (strlen($encryptStr) % $block); //Compute how many characters need to pad
        $encryptStr .= str_repeat(chr($pad), $pad); // After pad, the str length must be equal to block or its integer multiples

        // encrypt
        $encrypted = mcrypt_generic($module, $encryptStr);

        // close
        mcrypt_generic_deinit($module);
        mcrypt_module_close($module);

        return base64_encode($encrypted);
    }

    /**
     * 解密
     * @param string $encryptStr
     * @return bool|string
     */
    public function decrypt($encryptStr)
    {
        $localIV = $this->iv;
        $encryptKey = $this->encryptKey;

        // open module
        $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, $localIV);

        mcrypt_generic_init($module, $encryptKey, $localIV);

        $encryptedData = base64_decode($encryptStr);
        $encryptedData = mdecrypt_generic($module, $encryptedData);

        return $encryptedData;
    }
}

Example:

$privateKey = '1234567890abcdef';
$iv = 'aes-cbc-iv';
$magicCrypt = new MagicCrypt($privateKey, $iv);
$encryptString = $magicCrypt->encrypt($encryptString);
$decryptString = $magicCrypt->decrypt($encryptString);

var_dump($encryptString);
var_dump($decryptString);