php - StrPos always returns False? -

i've been working on basic search engine. operates checking if word exists. if does, returns link. know of suggest create database phpmyadmin don't remember password make mysql_connect command work.

anyway here code:

<?php  session_start();  $searchinput = $_post['search'];  var_dump($inputpage1); var_dump($searchİnput);  $inputpage1 = $_session['ponetext']; $inputpage2 = isset($_session['ptwotext']) ? $_session['ptwotext'] : ""; $inputpage3 = isset($_session['pthreetext']) ? $_session['pthreetext'] : "";  if (strpos($inputpage1, $searchinput)) {     echo "true"; } else {     echo "false"; }  ?> 

when search word, word page, weather exists or not, returns false. know why?

from php documentation:

warning: function may return boolean false, may return non-boolean value evaluates false. please read section on booleans more information. use === operator testing return value of function.

so function returns integer 0 since $searchinput starts @ first character of $inputpage1. since inside if condition, expects boolean, integer converted one. when converted boolean, 0 equal false instead else block executed.

to fix it, need use !== operator (the not equal equivalent of ===):

if (strpos($inputpage1, $searchinput) !== false) {     //...