PHP: Determine whether an object field matches needle.

gistfile1.php

<?php 
$arr = array( new stdClass(), new stdClass() ); 
$arr[0]->colour = 'red'; 
$arr[1]->colour = 'green'; 
$arr[1]->state  = 'enabled'; 

if (in_array_field('red', 'colour', $arr)) 
   echo 'Item exists with colour red.'; 
if (in_array_field('magenta', 'colour', $arr)) 
   echo 'Item exists with colour magenta.'; 
if (in_array_field('enabled', 'state', $arr)) 
   echo 'Item exists with enabled state.'; 
?> 

Output: 
-------- 
Item exists with colour red. 
Item exists with enabled state. 

<?php 
function in_array_field($needle, $needle_field, $haystack, $strict = false) { 
    if ($strict) { 
        foreach ($haystack as $item) 
            if (isset($item->$needle_field) && $item->$needle_field === $needle) 
                return true; 
    } 
    else { 
        foreach ($haystack as $item) 
            if (isset($item->$needle_field) && $item->$needle_field == $needle) 
                return true; 
    } 
    return false; 
} 
?>