in_array() expects parameter 2 to be array, string given in Classipress

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I’m using Classipress theme for wordpress, and I’m trying to sticky my featured ads on the on in categories .

I found a code that is return this error:

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Warning: in_array() expects parameter 2 to be array, string given in loop-ad_listing.php on line 26

To use the sticky on top code, I had to edit two pages and insert two codes and I’ll post the error part:

First: loop-ad_listing.php

Code1:

global $postisfeatured;
global $featurePostArray;

if ($postisfeatured == "1") 
    array_push($featurePostArray, $post->ID);

if (in_array($post, "ID", $featurePostArray) && $postisfeatured != "1") 
    echo '<div class="hide">';

Code2:

if ($postisfeatured != "1") {
    appthemes_after_endwhile();
    $postisfeatured = "";
}

That line: if (in_array($post,"ID",$featurePostArray) && $postisfeatured != "1") {
is the error.

Post Views: 2

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4 comments

  1. the signature for in_array looks like:

      in_array($needle, $haystack, $strict = FALSE);

    where:

    needle is the string,int,resource etc which you’re searching for.

    haystack is the array in which you’re searching

    strict (optional) If (or not) the matched item should be identical (===)

  2. You aren’t using the in_array function as it should be used.

    In the second parameter you’ve placed a string (i.e "ID"), it’s wrong; you should place the array that you wish to search in, at that spot.

    The outcome should be something like this:

    $valueToSearch = "a";
$arrayToSearch = array("a", "b", "c");
echo in_array($valueToSearch, $arrayToSearch);

    Please refer to the documentation

  3. You used “ID” as a second parameter which is a string. Try the following:

    if ( is_array($featurePostArray) && in_array($post->ID, $featurePostArray) ) {
    //some action
}

  4. I think I solved this problem. I’ve got similiar situation in my form field select multiple which automatically creates not simple variable but array type variable(PHP weak var types). So when I declared the value at first in my code:

    1. $lang='';
    2. then $lang=$_POST['lang'];
    3. <select id="lang" name="lang[]" multiple size="3">
      <option value="en"<?php if(in_array('en',$lang)) echo ' selected';?>>English</option>
      <option value="fr"<?php if(in_array('fr',$lang)) echo ' selected';?>>French</option>
      <option value="pl"<?php if(in_array('pl',$lang)) echo ' selected';?>>Polish</option>
      </select><br>
    4. and then I tried to run script and select none of the option I got known error “in_array() expects parameter 2…”
    5. solution is to set(in point 1.) to empty array $lang=array();