Php convert date time to timestamp

- Php convert datetime to timestamp
- Php convert date time to unix timestamp
- Php convert date time string to timestamp
- Php convert mysql datetime to timestamp
- Php convert unix timestamp to readable date/time
- Php convert datetime object to unix timestamp
- Php convert datetime string to unix timestamp
- Php convert mysql datetime to unix timestamp
- Php date functions
- Current date in php
- Php timestamp