Match a string in an array strpos(): Empty needle

Question

I have a string from database that I want to match with an array but it results in error saying:

strpos(): Empty needle in line X

if (!isset($_SESSION['arry'])) {
    $_SESSION['arry'] = array();
}
$imp = 42;
$arrys =  $_SESSION['arry'];

foreach($arrys as $string)
{
  if(strpos($imp, $string) !== false) 
  {
    $pow =1;
    break;
  }
}

if($pow==1){ exit; }

The array looks like this:

Array
(
    [0] => 218
    [1] => 219
    [2] =>  218
    [3] => 220
    [4] => 222
    [5] =>  42
    [6] => 223
)

Answer 1

You are doing the opposite way , searching string in 42 , instead go for

strpos($string, $imp)

TRY THIS : (updated)

<?php

    $_SESSION['arry'] = array(236,235,239,243,246);

$imp =  239;
$arrys =  $_SESSION['arry'];
$arrys = array_unique($arrys);
$pow = "";
print "<pre>";
print_r($arrys);
print "</pre>";
foreach($arrys as $string)
{
if($string == $imp)  {
    $pow = 1; echo "we have".$imp."in array<br/>";
}
else{
    $pow = 0; echo "sorry".$imp."wasn't found in array<br/>";
}
}
?>