PHP iconv() Error: Detected Illegal Character - Troubleshooting Guide

This error message indicates that the PHP function 'iconv()' has detected an illegal character in the input string. This means that the function is unable to convert the input string to the desired output format because it contains a character that is not recognized or supported by the function.

To resolve this issue, you can try the following:

1. Use a different encoding format: If the input string is in a non-standard encoding format, try converting it to a different encoding format that is recognized by the 'iconv()' function.

2. Use a character set converter: You can use a character set converter tool to convert the input string to the desired output format.

3. Remove the illegal character: If the input string contains an illegal character that cannot be converted, you can try removing it from the string before passing it to the 'iconv()' function.

4. Use a different function: If the 'iconv()' function is unable to convert the input string, you can try using a different PHP function that supports the desired output format.