Changed functions
New Classes and Interfaces
Migrating from PHP 5.6.x to PHP 7.0.x
PHP Manual
New functions
Closure
Closure::call()
CSPRNG
random_bytes()
random_int()
Error Handling and Logging
error_clear_last()
GNU Multiple Precision
gmp_random_seed()
Math
intdiv()
PCRE
preg_replace_callback_array()
POSIX
posix_setrlimit()
Reflection
ReflectionParameter::getType()
ReflectionFunctionAbstract::getReturnType()
Zlib Compression
inflate_add()
deflate_add()
inflate_init()
deflate_init()
Changed functions
New Classes and Interfaces
Migrating from PHP 5.6.x to PHP 7.0.x
PHP Manual