How can PHP developers prevent the conversion of unrecognized characters to question marks in their applications?

When PHP encounters unrecognized characters, it may convert them to question marks, causing data loss or corruption. To prevent this, PHP developers can set the default_charset to a suitable encoding in their php.ini file or use the header() function to specify the content type and charset in their PHP scripts. 

// Set the default charset in php.ini
default_charset = "UTF-8";
```

```php
// Specify the content type and charset in PHP script
header('Content-Type: text/html; charset=UTF-8');

Keywords

PHP character encoding mb_detect_encoding iconv UTF-8

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