check is duplicate value in array - php

has_duplicate.php

<?php
//check duplicate entry
$arr = [1,2,3,3,3,4,4,5,6,7,8,9,10,10,10,10,10,20,20];

// solution 1
function has_duplicate1($array) {
	$dupl = [];
	$space = php_sapi_name() == 'cli' ? "\n" : "<br>";
	foreach(array_count_values($array) as $value => $count) {
		if ($count > 1) {
			$dupl[$count] = $value;
			printf("duplicate value = [%s] AND count = [%s] %s", $dupl[$count], $count, $space);
		} 
	}
}

// solution 2
function has_duplicate2($array) {
	$space = php_sapi_name() == 'cli' ? "\n" : "<br>";
	$dupl = [];
	foreach ($array as $value) {
		if (++$dupl[$value] > 1) {
			printf("duplicate value = [%s] %s", $value, $space);
		}
	}
}

// run
has_duplicate1($arr);
echo "<hr>";
has_duplicate2($arr);