How can errors related to undefined variables or functions be resolved in PHP code?

To resolve errors related to undefined variables or functions in PHP code, you can ensure that the variables are properly initialized before use and that the functions are defined or included in the script. You can also use isset() or function_exists() functions to check if a variable or function is defined before using it to prevent errors. 

// Check if a variable is defined before using it
if(isset($variable)){
    // Use the variable here
}

// Check if a function exists before calling it
if(function_exists('function_name')){
    // Call the function here
}

Keywords

Undefined variable Undefined function Error handling PHP Debugging

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