New global constants

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- PHP Manual
- Migrating from PHP 5.5.x to PHP 5.6.x
- New global constants

## New global constants

### GD

- `IMG_WEBP` (as of PHP 5.6.25)

### LDAP

- `LDAP_ESCAPE_DN`
- `LDAP_ESCAPE_FILTER`

### OpenSSL

- `OPENSSL_DEFAULT_STREAM_CIPHERS`
- `STREAM_CRYPTO_METHOD_ANY_CLIENT`
- `STREAM_CRYPTO_METHOD_ANY_SERVER`
- `STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT`
- `STREAM_CRYPTO_METHOD_TLSv1_0_SERVER`
- `STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT`
- `STREAM_CRYPTO_METHOD_TLSv1_1_SERVER`
- `STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT`
- `STREAM_CRYPTO_METHOD_TLSv1_2_SERVER`

### PostgreSQL

- `PGSQL_CONNECT_ASYNC`
- `PGSQL_CONNECTION_AUTH_OK`
- `PGSQL_CONNECTION_AWAITING_RESPONSE`
- `PGSQL_CONNECTION_MADE`
- `PGSQL_CONNECTION_SETENV`
- `PGSQL_CONNECTION_SSL_STARTUP`
- `PGSQL_CONNECTION_STARTED`
- `PGSQL_DML_ESCAPE`
- `PGSQL_POLLING_ACTIVE`
- `PGSQL_POLLING_FAILED`
- `PGSQL_POLLING_OK`
- `PGSQL_POLLING_READING`
- `PGSQL_POLLING_WRITING`