INTRODUCINGPHP5.3详解.PDFVIP

INTRODUCING PHP 5.3 PHP Quebec 2008 - Ilia Alshanetsky 1 EVOLUTIONARY RELEASE Old code will still work Focus on mainly improvement of existing functionality Fewer bugs Faster release cycle 2 Namespaces Biggest addition in 5.3 code base Feature complete implementation of namespaces Majority of functionality implemented at compile time Simplifies naming conventions 3 Cleaner Code Without Namespaces With Namespaces function MY_wrapper ()  {} namespace MY; class MY_DB  {  } function wrapper ()  {} define(MY_CONN_STR,  ); class DB  {  } const CONN_STR =  ; + = use MY AS MY; MY_wrapper (); wrapper (); new MY_DB (); new DB(); MY_CONN_STR; CONN_STR; 4 Multiple Namespaces Per File namespace LIB; class MySQL  {} class SQLite  {} $b = new SQLite(); string(18) LIB_EXTRA::MScrypt namespace LIB_EXTRA; string(11) LIB::SQLite class MScrypt  {} $a = new MScrypt (); var_dump(         get_class($a),         get_class($b) ); 5 Namespace Hierarchy namespace  foo; function strlen($foo)  { return htmlent