What are common debugging techniques in PHP to identify errors in scripts that prevent them from executing multiple times?

One common debugging technique in PHP to identify errors in scripts that prevent them from executing multiple times is to use error reporting functions like error_reporting() and ini_set('display_errors', 1) to display any errors or warnings that may be occurring. Additionally, using functions like var_dump() or print_r() to inspect variables and data at various points in the script can help pinpoint where issues are arising. Lastly, utilizing tools like Xdebug or PHP's built-in debugging features can provide more in-depth analysis and tracing of script execution.

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

// Code snippet with debugging techniques
$number = 10;

// Display variable value for debugging
var_dump($number);

// Simulate an error for debugging
$sum = $number + 'abc';

echo $sum;
?>