Invalid characters in PHPexcelreader are related to timeout.

Invalid PHPexcelreader characters and timeout Notice: iconv () [function. iconv]: DetectedanillegalcharacterininputstringinD: \ WebSite \ htdocs use PHPexcelreader illegal characters and timeout problems
Notice: iconv () [function. iconv]: Detected an illegal character in input string in D: \ WebSite \ htdocs \ phpExcelReader \ Excel \ reader. php on line 1055

Fatal error: Maximum execution time of 30 seconds exceeded in D: \ WebSite \ htdocs \ ex_cmk.php on line 38



Currently, I have imported an EXCEL file into MYSQL, and I have tried it several times. This is not the case. may anyone in the world know this?
What does the above mean? How can we solve this problem? The excel file is relatively large.

I tried to reduce the number of rows, that is, the original file contains more than 600 rows. I tried setting an interrupt to 200 rows, because I have a file with more than 200 rows,
There is no problem with the import. After the test, you can import the data, but there is a problem.

Notice: Undefined variable: formatstr in D: \ WebSite \ htdocs \ phpExcelReader \ Excel \ reader. php on line 635

I still want to know why.
I am using phpexcelreader. this is available on the network. I have not found the function for uploading attachments.


------ Solution --------------------
The first is an error in iconv () character encoding conversion.
The second Maximum execution time of 30 seconds indicates that PHP execution times out.




------ Solution --------------------
Detected an illegal character in input string in D: \ WebSite \ htdocs \ phpExcelReader \ Excel \ reader. php on line 1055

This is probably because a special character exists in excel.