xx time ago function doesn't work - php

Question

I am trying to display "{number} {unit-of-time} ago" in my chat. However, when I'm expecting something like "2 minutes ago", I see "45 years" instead.
Nobody has an answer?
Here is the script:
<?php
$con = mysql_connect("localhost", "user", "pword");
mysql_select_db('chat', $con);
$result1 = mysql_query("SELECT * FROM logs ORDER BY id ASC");
$tm = mysql_query("SELECT timestamp FROM logs ORDER BY id ASC");
function _ago($tm, $rcs = 0)
{
$cur_tm = time();
$dif = $cur_tm - $tm;
$pds = array('second', 'minute', 'hour', 'day', 'week', 'month', 'year');
$lngh = array(1, 60, 3600, 86400, 604800, 2630880, 31570560);
for ($v = sizeof($lngh) - 1; ($v >= 0) && (($no = $dif / $lngh[$v]) <= 1); $v--) ;
if ($v < 0) $v = 0;
$_tm = $cur_tm - ($dif % $lngh[$v]);
$no = floor($no);
if ($no <> 1) $pds[$v] .= 's';
$x = sprintf("%d %s ", $no, $pds[$v]);
if (($rcs == 1) && ($v >= 1) && (($cur_tm - $_tm) > 0)) $x .= time_ago($_tm);
return $x;
}
$timeagochat = _ago($tm, $rcs = 0);
while ($extract = mysql_fetch_array($result1)) {
echo "<p class='show_message'><span class='uname'>" . $extract['username'] . "</span> <span class='time'>" . $timeagochat . " </span><br><span class='msg'>" . $extract['msg'] . "</span></p><br>";
}
?>
What can I do to let this function work?

Answer 1

You have to fetch the date:
$tm = mysql_query("SELECT timestamp AS t FROM logs ORDER by id ASC")->fetch_assoc()['t']; //obviously, check the size before you fetch
You probably want to use strtotime() so for instance:
$dif = $cur_tm-strtotime($tm);
The $dif will be in milliseconds.
What are you doing with the loops and the arrays? Too confusing.
5. WHY DO PEOPLE KEEP USING mysql_!!!