Migration51-Phpdoc专题 Migrating from PHP 5.0.x to PHP 5.1.x 目录 Key PHP 5.1.x features Changes in reference handling Reading [] Integer values in function parameters Class and object changes Extensions Date/time support Changes in database support Checking for E_STRICT 参见 PHP 版本迁移指南 5.0.x, 5.2.x, 5.3.x, 5.4.x, 5.5.x and 5.6.x.