Turns encryption on/off on an already connected socket

# stream_socket_enable_crypto

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

stream_socket_enable_crypto — Turns encryption on/off on an already connected socket

### Description

stream_socket_enable_crypto(
resource `$stream`,
bool `$enable`,
?int `$crypto_method` = `null`,
?resource `$session_stream` = `null`
): int|bool

Enable or disable encryption on the stream.

Once the crypto settings are established, cryptography can be turned on and off dynamically by passing `true` or `false` in the `enable` parameter.

### Parameters

`stream`

  The stream resource.

`enable`

  Enable/disable cryptography on the stream.

`crypto_method`

  Setup encryption on the stream. Valid methods are

  - `STREAM_CRYPTO_METHOD_SSLv2_CLIENT`
  - `STREAM_CRYPTO_METHOD_SSLv3_CLIENT`
  - `STREAM_CRYPTO_METHOD_SSLv23_CLIENT`
  - `STREAM_CRYPTO_METHOD_ANY_CLIENT`
  - `STREAM_CRYPTO_METHOD_TLS_CLIENT`
  - `STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT`
  - `STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT`
  - `STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT`
  - `STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT` (as of PHP 7.4.0)
  - `STREAM_CRYPTO_METHOD_SSLv2_SERVER`
  - `STREAM_CRYPTO_METHOD_SSLv3_SERVER`
  - `STREAM_CRYPTO_METHOD_SSLv23_SERVER`
  - `STREAM_CRYPTO_METHOD_ANY_SERVER`
  - `STREAM_CRYPTO_METHOD_TLS_SERVER`
  - `STREAM_CRYPTO_METHOD_TLSv1_0_SERVER`
  - `STREAM_CRYPTO_METHOD_TLSv1_1_SERVER`
  - `STREAM_CRYPTO_METHOD_TLSv1_2_SERVER`
  - `STREAM_CRYPTO_METHOD_TLSv1_3_SERVER` (as of PHP 7.4.0)

  If omitted, the `crypto_method` context option on the stream's SSL context will be used instead.

`session_stream`

  Seed the stream with settings from `session_stream`.

### Return Values

Returns `true` on success, `false` if negotiation has failed or `0` if there isn't enough data and you should try again (only for non-blocking sockets).

### Changelog

Version | Description
--- | ---
8.0.0 | `session_stream` is now nullable.

### Examples

Example #1 stream_socket_enable_crypto() example

`<?php
$fp = stream_socket_client("tcp://myproto.example.com:31337", $errno, $errstr, 30);
if (!$fp) {
die("Unable to connect: $errstr ($errno)");
}
/* Turn on encryption for login phase */
stream_socket_enable_crypto($fp, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
fwrite($fp, "USER god\r\n");
fwrite($fp, "PASS secret\r\n");
/* Turn off encryption for the rest */
stream_socket_enable_crypto($fp, false);
while ($motd = fgets($fp)) {
echo $motd;
}
fclose($fp);
?>`

The above example will output something similar to:

### See Also

- OpenSSL Functions
- List of Supported Socket Transports

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