Get hash tag with php

hash-tag.php

<?php
/*
 * First array return "tags" with hash, example: #Example
 * Second "tag" return without hash, Example: Example
 *
 * @string $tweet The text
 * @function preg_match_all  |  Pattern  |  @string $tweet (The text)  |  @array $tags (output array the tags)
 * @return array $tags
 */
$twet = "But I must #explain to u how all this #mistaken idea of #denouncing pleasure and praising pain was born and I'll #give you a complete accout";
preg_match_all( "/#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/u", $tweet, $tags );

echo "<pre>";

var_dump( $tags );