Anteriormente, se emitía una advertencia al invocar funciones definidas por el usuario con muy pocos argumentos. Ahora, esta advertencia ha sido promovida a una excepción de tipo Error. Este cambio solamente se aplica a funciones definidas por el usuario, no a funciones internas. Por ejemplo:
<?php
function test($param){}
test();
Salida del ejemplo anterior en PHP 5.5:
Uncaught Error: Too few arguments to function test(), 0 passed in %s on line %d and exactly 1 expected in %s:%d
Dynamic calls for certain functions have been forbidden (in the form of $func() or array_map('extract', ...), etc). These functions either inspect or modify another scope, and present with them ambiguous and unreliable behavior. The functions are as follows:
<?php
(function () {
'func_num_args'();
})();
El resultado del ejemplo sería:
Warning: Cannot call func_num_args() dynamically in %s on line %d
The following names cannot be used to name classes, interfaces, or traits:
Integer operations and conversions on numerical strings now respect scientific notation. This also includes the (int) cast operation, and the following functions: intval() (where the base is 10), settype(), decbin(), decoct(), and dechex().
mt_rand() will now default to using the fixed version of
the Mersenne Twister algorithm. If deterministic output from
mt_srand() was relied upon, then the
MT_RAND_PHP with the ability to preserve the old
(incorrect) implementation via an additional optional second parameter to
mt_srand().
rand() and srand() have now been made aliases to mt_rand() and mt_srand(), respectively. This means that the output for the following functions have changes: rand(), shuffle(), str_shuffle(), and array_rand().
The ASCII delete control character (0x7F) can no longer be used in identifiers that are not quoted.
error_log changes with syslog
value
If the error_log ini setting is set to
syslog, the PHP error levels are mapped to the syslog
error levels. This brings finer differentiation in the error logs in
contrary to the previous approach where all the errors are loggged with the
notice level only.
Destructors are no longer called upon incomplete objects (such as throwing an exception in the constructor).
call_user_func() will now always fail upon calls to functions that expect references as arguments.
The following ini directives have been removed:
session.entropy_file
session.entropy_length
session.hash_function
session.hash_bits_per_character