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Changed functions

PHP Core

crypt() will now raise an E_NOTICE error if the salt parameter is omitted.
substr_compare() will now accept 0 for its length parameter.
unserialize() will now fail if passed serialised data that has been manipulated to attempt to instantiate an object without calling its constructor.

cURL

Uploads using the @file syntax are now only supported if the CURLOPT_SAFE_UPLOAD option is set to false. CURLFile should be used instead.

Mcrypt

The source parameter of mcrypt_create_iv() now defaults to MCRYPT_DEV_URANDOM instead of MCRYPT_DEV_RANDOM.

OpenSSL

stream_socket_enable_crypto() now allows the crypto_type parameter to be optional if the stream's SSL context includes the new crypto_type option.

PostgreSQL

pg_insert(), pg_select(), pg_update() and pg_delete() are no longer experimental.
pg_send_execute(), pg_send_prepare(), pg_send_query() and pg_send_query_params() will no longer block until query write completion if the underlying socket stream for the database connection is set to non-blocking mode.

Reflection

ReflectionClass::newInstanceWithoutConstructor() now allows non-final internal classes to be instantiated.

XMLReader

XMLReader::getAttributeNs() and XMLReader::getAttributeNo() now return null if the attribute could not be found, like XMLReader::getAttribute().