A non well formed numeric value encountered

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1. Fatal error: Maximum execution time of 30 seconds exceeded in...
2. Fatal error: Uncaught Error: Cannot use object of type stdClass as array in ...
3. Warning: Use of undefined constant ... - assumed '...' (this will throw an Error in a future version of PHP) in ....php on line ...
4. ERROR: Call to undefined method Maatwebsite\Excel\Excel::load()
5. Maximum execution time of 30 seconds exceeded
6. Your requirements could not be resolved to an installable set of packages. ... To enable extensions, verify that they are enabled in your .ini files:
7. could not find driver
8. the requested PHP extension mbstring is missing from your system.
9. the requested PHP extension dom is missing from your system.
10. A non well formed numeric value encountered
11. Warning: Cannot modify header information - headers already sent by ...
12. php_network_getaddresses: getaddrinfo failed: Name or service not known
13. XMLWriter::openUri(): Unable to resolve file path
14. Object of class stdClass could not be converted to string
15. Class 'Google_Service_Youtube' not found