Upgrade PHP - Backward Incompatible changes

[amirk]

Hi,

I've inherited a sever on which PHP is installed:

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$ php -version

PHP 5.1.6 (cli) (built: Nov  3 2006 10:51:56)
Copyright (c) 1997-2006 The PHP Group
Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies
    with Zend Extension Manager v1.2.2, Copyright (c) 2003-2007, by Zend Technologies
    with Zend Optimizer v3.3.3, Copyright (c) 1998-2007, by Zend Technologies

Quite an old version of PHP. I'd like to move an existing site to a new server with recent version of PHP installed on it and I'd like to do it as safely as I could.

Would I be able to compile the existing code against a newer version of PHP to ensure nothing's broken (e.g.: no backward incompatible function or feature is used)? Or do I have to go version by version and extract changes from change logs and search the code for possible infringement?
Could Zend Engine do that for us?

Thanks,
~Amir

[egami]

You could always run the code from command line

php -l filename.php

and it will report any incompatibilities.

[amirk]

Thanks. I suppose running

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find . -name "*.php" -exec php -l '{}' \;

from website's root directory does the trick.

But "-l" does a syntax check. Is that sufficient (in Java, for instance, we compile codes)? Also, does Zend Engine help at all?

I'm sorry if the questions don't make sense. I'm not really a PHP developer.

[egami]

That should do the trick..


results will look like this..

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No syntax errors detected in ./wiki/tests/selenium/SeleniumTestListener.php
No syntax errors detected in ./wiki/tests/selenium/SeleniumTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiHelpFieldHintTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiInstallationConfig.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiErrorsNamepageTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiInstallationCommonFunction.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiRightFrameworkLinksTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiButtonsAvailabilityTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiErrorsConnectToDatabasePageTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiInstallationVariables.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiRestartInstallationTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiDifferntDatabasePrefixTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiInstallerTestSuite.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiMySQLDataBaseTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiMySQLiteDataBaseTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiOnAlreadyInstalledTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiInstallationMessage.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiDifferentDatabaseAccountTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiUserInterfaceTestCase.php
No syntax errors detected in ./wiki/tests/selenium/installer/MediaWikiUpgradeExistingDatabaseTestCase.php
No syntax errors detected in ./wiki/tests/selenium/SeleniumServerManager.php
No syntax errors detected in ./wiki/tests/selenium/SeleniumTestConsoleLogger.php
No syntax errors detected in ./wiki/tests/selenium/SeleniumTestHTMLLogger.php
No syntax errors detected in ./wiki/tests/selenium/Selenium.php
No syntax errors detected in ./wiki/tests/selenium/SeleniumLoader.php
No syntax errors detected in ./wiki/tests/selenium/SeleniumTestConstants.php
No syntax errors detected in ./wiki/tests/selenium/suites/SimpleSeleniumTestSuite.php