How can developers troubleshoot and resolve errors related to constants not being recognized in PHP code?

When constants are not being recognized in PHP code, developers should ensure that the constants are defined correctly using the `define()` function before they are used in the code. Additionally, developers should check for any typos or misspellings in the constant names. If the constants are defined in a separate file, developers should make sure that the file is included in the script. 

// Define the constant
define('MY_CONSTANT', 'Hello World');

// Use the constant in the code
echo MY_CONSTANT;

Keywords

PHP Constants Error Troubleshooting Resolution

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