What potential issues can arise when updating from PHP4 to PHP5 on a forum platform like phpBB?

One potential issue that can arise when updating from PHP4 to PHP5 on a forum platform like phpBB is deprecated functions and syntax that are no longer supported in PHP5. To solve this issue, you will need to update the codebase to use PHP5 compatible functions and syntax. 

// Replace deprecated functions with their PHP5 equivalents
// For example, replace ereg() with preg_match()

// Before
if (ereg('pattern', $string)) {
    // Do something
}

// After
if (preg_match('/pattern/', $string)) {
    // Do something
}

Keywords

PHP4 PHP5 forum platform phpBB compatibility issues

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