How can PHP developers effectively troubleshoot and debug scripts that are not running correctly, especially when the original script source is no longer available?

When troubleshooting and debugging PHP scripts that are not running correctly and the original script source is not available, developers can start by checking for syntax errors, using error reporting functions like error_reporting() and ini_set(), and utilizing debugging tools like Xdebug. Additionally, developers can try to isolate the issue by commenting out sections of the code or using print statements to identify problematic areas. 

<?php
// Enable error reporting and display errors
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Your PHP code here
// Example: 
$variable = 'Hello, World!';
echo $variable;
?>

Keywords

PHP debugging troubleshooting error messages source code

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