note 106162 added to tutorial.useful

<?php if (strpos($_SERVER['HTTP_USER_AGENT'], 'Mozilla') != FALSE) { echo 'You are using Mozilla Firefox.<br />'; } ?> I ran the codes above in Firefox, the result was not what I had expected. Finally, I figured out that: 1. strpos('Mozilla xxxx', 'Mozilla') returns 0 which equals to FALSE. 2. I typed "!==" as "!=", they have different effects. Below is some snippets from http://www.php.net/manual/en/language.operators.comparison.php $a != $b Not equal TRUE if $a is not equal to $b after type juggling. $a !== $b Not identical TRUE if $a is not equal to $b, or they are not of the same type. (introduced in PHP 4) ---- Server IP: 69.147.83.197 Probable Submitter: 122.235.249.243 ---- Manual Page -- http://www.php.net/manual/en/tutorial.useful.php Edit -- https://master.php.net/note/edit/106162 Del: integrated -- https://master.php.net/note/delete/106162/integrated Del: useless -- https://master.php.net/note/delete/106162/useless Del: bad code -- https://master.php.net/note/delete/106162/bad+code Del: spam -- https://master.php.net/note/delete/106162/spam Del: non-english -- https://master.php.net/note/delete/106162/non-english Del: in docs -- https://master.php.net/note/delete/106162/in+docs Del: other reasons-- https://master.php.net/note/delete/106162 Reject -- https://master.php.net/note/reject/106162 Search -- https://master.php.net/manage/user-notes.php