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php string to timestamp
In PHP, you can use the "strtotime()" function to convert a string to a timestamp.
strtotime description and usage
strtotime Parses the date and time description of any string into a Unix timestamp
strtotime ( string $time [, int $now = time() ] ) : int
This function is expected to accept a string containing the United States A string in English date format and attempts to parse it into a Unix timestamp (number of seconds since January 1 1970 00:00:00 GMT) relative to the time given by the now parameter, or if this parameter is not provided The current system time.
This function will use the TZ environment variable (if any) to calculate the timestamp. Since PHP 5.1.0 there is an easier way to define the time zone used in all date/time functions. This process is documented on the date_default_timezone_get() function page.
strtotime parameter
time: date/time string. The correct format is explained in Date and Time Format.
now: The timestamp used to calculate the return value.
strtotime return value
Returns the timestamp if successful, otherwise returns FALSE. Prior to PHP 5.1.0, this function returned -1 on failure.
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