惠新宸关于php7的说明文档，里面着重介绍了性能问题，诸如phpng、jit、ast，也有很多关于性能方面的测试，还有一些新的语法说明。
About PhP 20 years histor Most popular Web service program language php Over 82% sites are use PhP as server program language PHP 82.0% ASPNET 17.0% Java2.9% Cold Fusion.7%/ Ruby10.6% Perl 0.5% othon.2% JavaScript 0.2%/ Erlang 0.1% W3Techs. com 12 April 2015 Percentages of websites using various server-side programming languages Note: a website may use more than one server-side programming language PHP 7 New Features PHP 7? PHP NG- Engine Refactor-performance improvements Abstarct Syntan Tree Int64 Improvement Uniform variable syntax Native TLs Consistently foreach behaviors New<=>,兴兴,?? operaters Return Type declarations Scalar Type declarations Exceptions in Engine And dozens features PHP/ Abstract Syntax Tree COMPATIBLE PHP5 PHP Parser Opcodes Execution PHP7 PHP Parser AST命| OpcodesDExecution PHP/ Int64 Improvement COMPATIBLE >2GB string >2GB file uploading Fully 64bits intgers cross platforms string size signed integer Platform int long LP64 32 bit 64 bit LLP64 32 bit 32 bit ILP64 64 bit 64 bit PHP/ Uniform Variables Syntan AUTIO SfooOlbar 10 ICAUTIONI Sfool'bar']: spaz foo00-(foo00 Sfoo->bar: bazo function{….)0 Sthis->Sname [Sobj, 'method10 Foo: Sbar['baz'10 PHP5: Foo: Sbar['baz'1C PHP7: (Foo: sbarlbaz'10 PHP/ Return Type Declarations ● function foo(:aray{ COMPATIBLE return l interface A static function make(: A function fooD: DateTime i return null PHP Fatal error: Return value offooo must be an instance of DateTime, null returned PHP/ Scalar Type Declarations COMPATIBLE function foo(int num) function bar (string name) function foobar: float 1 function add(int 1, int r): int t class A i public function start(bool start)& PHP/