Migrating from PHP 5.0.x to PHP 5.1.x Table of ContentsKey PHP 5.1.x featuresChanges in reference handlingReading []Integer values in function parametersClass and object changesExtensionsDate/time supportChanges in database supportChecking 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.