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[web] Timestamp string to timestamp (PHP)

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I am trying to convert a string passed to the script via GET into a timestamp of int form to be used with date() and the associated functions. page.php?time=1097749860000
function strtoint( $str ) {
	$ret = 0;
	$mult = 1;
	for ( $i = strlen( $str ) - 1; $i >= 0; $i-- ) {
	print $str{$i} . ' * ' . $mult . ' = ' . ( $str{$i} * $mult ) . '<br />';
		$ret += $str{ $i } * $mult;
		$mult *= 10;
	return $ret;

$time = $_GET[ 'time' ]; // doesnt work
$time = intval( $_GET[ 'time' ] ); // doesnt work
$time = strtoint( $_GET[ 'time' ] ); // returns a float because the number is larger than an int, so doesnt work.

I've tried everything (i think) an answer or at least a point in the right direction would be greatly appreciated!

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The 'time-string' you pass seems to be wrong.
Try page.php?time=1041526713

$time = $_GET[ 'time' ]; // works fine
if(is_numeric($time)) echo "numeric<br />";
echo $time;
echo "<br />";
echo date("H:i:s", $time); // works fine
echo "<br />";

PHP (usually) doesn't care if it's an int or a string.

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You shouldn't need to convert the GET variable to an integer, PHP doesn't care about the variables type, except if you have explicitly set a type.

This means that you can directly parse it to a function after evaluating it as being a number, preferably with is_numeric().

if (is_numeric($_GET['time']))
echo strftime('%d.%m.%Y', $_GET['time']);
echo 'Invalid Timestamp!';

Furthermore I'd advise you to use strftime() instead of date() as you can see in my example. The reason is simple: strftime() respects the LOCALE you have set so that month and weekday names for example are directly translated.

More info on this:
- http://de2.php.net/manual/en/function.strftime.php
- http://de2.php.net/manual/en/function.setlocale.php
- http://de2.php.net/manual/en/function.is-numeric.php

Hope this helps.

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