Backward incompatible changes
Although most existing PHP 5 code should work without changes, please take note of some backward incompatible changes:
Array keys won't be overwritten when defining an array as a property of a class via an array literal
Previously, arrays declared as class properties which mixed explicit and implicit keys could have array elements silently overwritten if an explicit key was the same as a sequential implicit key. For example:
<?php
class C {
const ONE = 1;
public $array = [
self::ONE => 'foo',
'bar',
'quux',
];
}
var_dump((new C)->array);
?>
Результат выполнения данного примера в PHP 5.5:
array(2) {
[0]=>
string(3) "bar"
[1]=>
string(4) "quux"
}
Результат выполнения данного примера в PHP 5.6:
array(3) {
[1]=>
string(3) "foo"
[2]=>
string(3) "bar"
[3]=>
string(4) "quux"
}
json_decode() strictness
json_decode() now rejects non-lowercase variants of the JSON literals true, false and null at all times, as per the JSON specification, and sets json_last_error() accordingly. Previously, inputs to json_decode() that consisted solely of one of these values in upper or mixed case were accepted.
This change will only affect cases where invalid JSON was being passed to json_decode(): valid JSON input is unaffected and will continue to be parsed normally.
Stream wrappers now verify peer certificates and host names by default when using SSL/TLS
Все шифруемые клиентские потоки теперь по умолчанию включают проверку пиров. По умолчанию используется OpenSSL CA пакет для проверки сертификата пира. В большинстве случаев не требуется ничего делать для соединения с серверами с правильным SSL сертификатом, так как обычно OpenSSL уже настроен для использования хороших CA пакетов.
Стандартный CA пакет может быть переопределен глобально с помощью
установки или openssl.cafile или openssl.capath строк конфигурации,
или же на уровне каждого запроса используя опции контекста
cafile или
capath.
Хотя это и не рекомендуется, но можно отклчить проверку сертификата пира
для запроса, установив verify_peer
опцию контекста в FALSE, и можно отключить проверку имени пира, установив
verify_peer_name в FALSE.
GMP resources are now objects
GMP resources are now objects. The functional API implemented in the GMP extension has not changed, and code should run unmodified unless it checks explicitly for a resource using is_resource() or similar.
Mcrypt functions now require valid keys and IVs
mcrypt_encrypt(), mcrypt_decrypt(), mcrypt_cbc(), mcrypt_cfb(), mcrypt_ecb(), mcrypt_generic() and mcrypt_ofb() will no longer accept keys or IVs with incorrect sizes, and block cipher modes that require IVs will now fail if an IV isn't provided.
cURL file uploads
Uploads using the @file syntax now require CURLOPT_SAFE_UPLOAD to be set to
FALSE. CURLFile should be used instead.
Коментарии
Another breaking change involves opening the special "php://input" stream for decompression. In PHP 5.5, the following code would allow PHP to decode a gzip'd request input stream:
<?php
// Open the input stream for requests with Content-Encoding: gzip.
$input = gzopen('php://input','r');
// This has the same effect as fopen('compress.zlib://php://input','r').
// Get the decompressed request body.
var_dump(stream_get_contents($input));
?>
However in PHP 5.6 this does not work. Instead PHP gives the following warning: gzopen(): cannot represent a stream of type Input as a File Descriptor.
It is unclear whether this is a bug or intentional, backward-incompatible change.