Decript Ionic AES256 and PHP

Someone here who helps me please. I am encrypting data with aes256, link is in my function:

    encriptar(_encrypt) {
return this.aes256.encrypt(this.secureKey, this.secureIV,  _encrypt )
  .then((encrypt_) => {
    this.desencriptar(encrypt_);
    return encrypt_;
  })
  .catch((error: any) => console.error(error));
}

the value of this.secureKey ="12345678910123456789012345678901" and this.SecureIv = "1234567891123456"

Which in ionic encrypts and decrypts correctly. the error occurs when this encrypted data is sent by api rest and my php backend is not decrypted by my php function:

    define('AES_256_CBC', 'aes-256-cbc'); 
$encryption_key = "12345678910123456789012345678901"; 
$iv = "1234567891123456"; 
$encrypted = "0csm3Gjm6Q+ZNa+sjI+SYg== "; 
$encrypted = $encrypted . ':' . $iv; 
$parts = explode(':', $encrypted); echo "encriptado base64 : ".base64_encode($encrypted); 
echo "<br>"; 
echo $parts[0]; 
echo "<br>"; 
$decrypted = openssl_decrypt(base64_decode($parts[0]) , AES_256_CBC, $encryption_key, 0, $iv) ; 
echo "Decrypted: $decrypted\n";