What are some best practices for debugging PHP code, especially when working with regular expressions?

When debugging PHP code, especially when working with regular expressions, it is essential to use tools like var_dump() or print_r() to inspect variables and their values. Additionally, using online regex testers can help validate and troubleshoot regular expressions. It's also recommended to break down complex regular expressions into smaller parts and test each part individually to identify any issues. 

// Example PHP code snippet for debugging regular expressions
$pattern = '/[0-9]+/';
$string = 'abc123def456ghi';

if (preg_match($pattern, $string, $matches)) {
    var_dump($matches);
} else {
    echo 'No match found.';
}

Keywords

regex debugging PHP regular expressions troubleshooting

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