What are common issues when upgrading from PHP4 to PHP5, such as pages displaying as empty or changes in file extensions?

One common issue when upgrading from PHP4 to PHP5 is that pages may display as empty due to changes in error handling. To solve this, you can update your error reporting settings in the PHP configuration file to display errors. Another issue is changes in file extensions, where PHP files may need to be renamed from .php4 to .php. 

// Update error reporting settings in the PHP configuration file
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Rename PHP files from .php4 to .php

Keywords

PHP4 PHP5 upgrade file extensions empty pages

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