note 126137 added to function.substr

Prior to PHP 8, specifying length with zero-length strings or non-string values as input can produce potentially unexpected results. <?php foreach (['normal', '', true, false, NULL] as $value) { echo gettype(substr($value, 0, 10)) . ' ' . substr($value, 0, 10); } /* string normal boolean string 1 boolean boolean */ ?> ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.242 (proxied: 24.212.220.247) ---- Manual Page -- https://php.net/manual/en/function.substr.php Edit -- https://main.php.net/note/edit/126137 Del: integrated -- https://main.php.net/note/delete/126137/integrated Del: useless -- https://main.php.net/note/delete/126137/useless Del: bad code -- https://main.php.net/note/delete/126137/bad+code Del: spam -- https://main.php.net/note/delete/126137/spam Del: non-english -- https://main.php.net/note/delete/126137/non-english Del: in docs -- https://main.php.net/note/delete/126137/in+docs Del: other reasons-- https://main.php.net/note/delete/126137 Reject -- https://main.php.net/note/reject/126137 Search -- https://main.php.net/manage/user-notes.php