<?php

function analog_in_array($needle, array $haystack) {
	foreach($haystack as $item) {
		if($item == $needle) {
			return true;
		}
	}
	return false;
}

function analog_array_unique(array $array) {
	$tmp = [];
	foreach($array as $key => $item) {
		if(analog_in_array($item, $tmp)) {
			unset($array[$key]);
		}
		else {
			$tmp[] = $item;
		}
	}
	return $array;
}

$array = [1,1,2,3,4,2,5];
print_r($array);
print_r(analog_array_unique($array));