[PHP] Search a string in array values

array_pos.php

<?php
/**
 * Search a string in array values
 *
 * @param string $needle
 * @param array $haystack
 * @param bool $match_all - return all instances
 * @param bool $preg_mode - search in PCRE mode
 * @return mixed|array
 */
function array_pos($needle, $haystack, $match_all=false, $preg_mode=false)
{
  if ($match_all) $matches = array();
  
  foreach ($haystack as $i => $row)
  {
    if (!is_array($row))
    {
      if (!$preg_mode)
      {
        if (strpos($row, $needle) !== false)
        {
          if (!$match_all) return $i;
          else array_push($matches, $i);
        }
      }
      else
      {
        if (preg_match($needle, $row) === 1)
        {
          if (!$match_all) return $i;
          else array_push($matches, $i);
        }
      }
    }
  }
  
  if (!$match_all or !count($matches)) return false;
  return $matches;
}