#11 /wp-includes/template-loader.php(13): do_action('template_redire.') #9 /wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(NULL, Array) #7 /wp-content/plugins/ultimate-member/includes/core/class-form.php(569): do_action('um_submit_form_.', Array) If multiple parameters are supplied then isset () will return true only if all of the parameters are considered set. Also note that a null character ( '\0') is not equivalent to the PHP null constant. #6 /wp-includes/plugin.php(517): WP_Hook->do_action(Array) isset () will return false when checking a variable that has been assigned to null. #4 /wp-includes/class-wp-hook.php(308): um_submit_form_errors_hook(Array) However, it has some quirks and behaviours that are very much worth knowing as they can easily catch out. I would use the ternary operator to set a default value if you need to. Like the name implies, it is designed to verify if a variable given to it is set, returning a boolean value based on the result. You first check if the key is set before trying to access it. #3 /wp-content/plugins/ultimate-member/includes/core/um-actions-form.php(293): do_action('um_submit_form_.', Array) A Look At PHP's isset () isset () is one of the most important tools at your disposal to validate data in PHP. #2 /wp-includes/plugin.php(517): WP_Hook->do_action(Array) Thank you for explaining, that makes a lot more sense.After triggering the notice again, the following was output to the new file you recommended above: #0 /wp-includes/class-wp-hook.php(308): um_submit_form_errors_hook_(Array) John_Betong, thanks for the tips, i’ll do some reading up to figure out how to apply themĭroopsnoot,
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