strlen() error – CF7CF 2.5.9 – PHP 8.2

Jules, thank you for your highly useful plugin~

With CF7CF 2.5.9 + PHP 8.2 (+ WordPress 6.7.2) I’m getting this error message in my server log and failures of the plugin to complete:

PHP Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /.../wp-content/plugins/cf7-conditional-fields/cf7cf.php on line 434

That source code reads:

433: function wpcf7cf_endswith($string, $test) {
434: $strlen = strlen($string);

Clearly what’s required is a forced string type or alternative. There’s discussion of this aspect of strlen() in the User Contributor Notes at https://www.php.net/manual/en/function.strlen.php#127814

Although this is the only such incompatibility I’ve encountered between CF7CF 2.5.9 and PHP 8.2, strlen() is one of many functions that have developed backward vulnerabilities since PHP 7.2.

Happy coding,
Paul