in_array() and multidimensional array

Great function, but it didnt work for me until i added the if($found) { break; } to the elseif

function in_array_r($needle, $haystack) {
    $found = false;
    foreach ($haystack as $item) {
    if ($item === $needle) { 
            $found = true; 
            break; 
        } elseif (is_array($item)) {
            $found = in_array_r($needle, $item); 
            if($found) { 
                break; 
            } 
        }    
    }
    return $found;
}

This will do it:

foreach($b as $value)
{
    if(in_array("Irix", $value))
    {
        echo "Got Irix";
    }
}

in_array only operates on a one dimensional array, so you need to loop over each sub array and run in_array on each.

As others have noted, this will only for for a 2-dimensional array. If you have more nested arrays, a recursive version would be better. See the other answers for examples of that.

if your array like this

$array = array(
              array("name" => "Robert", "Age" => "22", "Place" => "TN"), 
              array("name" => "Henry", "Age" => "21", "Place" => "TVL")
         );

Use this

function in_multiarray($elem, $array,$field)
{
    $top = sizeof($array) - 1;
    $bottom = 0;
    while($bottom <= $top)
    {
        if($array[$bottom][$field] == $elem)
            return true;
        else 
            if(is_array($array[$bottom][$field]))
                if(in_multiarray($elem, ($array[$bottom][$field])))
                    return true;

        $bottom++;
    }        
    return false;
}

example : echo in_multiarray("22", $array,"Age");

Please try:

in_array("irix",array_keys($b))
in_array("Linux",array_keys($b["irix"])

Im not sure about the need, but this might work for your requirement

This is the first function of this type that I found in the php manual for in_array. Functions in the comment sections aren't always the best but if it doesn't do the trick you can look in there too :)

<?php
function in_multiarray($elem, $array)
    {
        // if the $array is an array or is an object
         if( is_array( $array ) || is_object( $array ) )
         {
             // if $elem is in $array object
             if( is_object( $array ) )
             {
                 $temp_array = get_object_vars( $array );
                 if( in_array( $elem, $temp_array ) )
                     return TRUE;
             }

             // if $elem is in $array return true
             if( is_array( $array ) && in_array( $elem, $array ) )
                 return TRUE;


             // if $elem isn't in $array, then check foreach element
             foreach( $array as $array_element )
             {
                 // if $array_element is an array or is an object call the in_multiarray function to this element
                 // if in_multiarray returns TRUE, than return is in array, else check next element
                 if( ( is_array( $array_element ) || is_object( $array_element ) ) && $this->in_multiarray( $elem, $array_element ) )
                 {
                     return TRUE;
                     exit;
                 }
             }
         }

         // if isn't in array return FALSE
         return FALSE;
    }
?>

It works too creating first a new unidimensional Array from the original one.

$arr = array("key1"=>"value1","key2"=>"value2","key3"=>"value3");

foreach ($arr as $row)  $vector[] = $row['key1'];

in_array($needle,$vector);