Here’s a function in PHP to validate Unix timestamp:
function isValidTimeStamp($strTimestamp) {
return ((string) (int) $strTimestamp === $strTimestamp)
&& ($strTimestamp <= PHP_INT_MAX)
&& ($strTimestamp >= ~PHP_INT_MAX);
}
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I think the following would be better, as the input could be an integer as well: (string) $strTimestamp
function isValidTimeStamp($strTimestamp) {
return ((string) (int) $strTimestamp === (string) $strTimestamp)
&& ($strTimestamp = ~PHP_INT_MAX);
}