Command-line script for manipulating timestamps

ts.php

#!/usr/bin/env php                                                                                                                                                                                                                      
<?php

/**
 * Command-line script for manipulating timestamps
 */

// parse options
$options = array('f'=>'r', 't'=>@date_default_timezone_get());
foreach(array_keys($options) as $arg)
{
        if(($idx = array_search("-$arg", $argv)) !== false)
                $options[$arg] = $argv[$idx+1];
}


// filter down to arguments
$args = preg_grep('/^-(f|u|t|)/', array_slice($argv,1), PREG_GREP_INVERT);

// show help
if(in_array('-h', $argv) || in_array('--help', $argv))
{
        echo "\nusage: $argv[0] [datestring] [-f <format>] [-t timezone] [-u]\n\n";
        echo " -f fmt   : a php format string\n";
        echo " -t tz    : a timezone string\n";
        echo " -u       : output a bare timestamp\n\n";
        exit(1);
}

$string = isset($args[0]) ? $args[0] : '@'.time();
$time = new DateTime($string, new DateTimeZone($options['t']));

if(in_array('-u',$argv))
        printf("%d\n", $time->getTimestamp());
else
        printf("%s => [%d]\n",$time->format($options['f']), $time->getTimestamp());