How can PHP developers properly handle error reporting and display to troubleshoot issues like undefined constants and variables?

When troubleshooting issues like undefined constants and variables in PHP, developers can enable error reporting to display detailed error messages. This can be done by setting the error_reporting level to E_ALL and displaying errors using ini_set('display_errors', 1). Additionally, developers can use isset() or defined() functions to check if a variable or constant is defined before using it. 

// Enable error reporting
error_reporting(E_ALL);
ini_set('display_errors', 1);

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

// Check if a constant is defined before using it
if(defined('CONSTANT_NAME')){
    // Use the constant
}

Keywords

error reporting error handling undefined constants undefined variables troubleshooting

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