What debugging techniques can be used to identify and resolve issues with PHP code, such as incorrect date output or string replacement?

To identify and resolve issues with PHP code like incorrect date output or string replacement, you can use techniques such as debugging with print statements, using var_dump or print_r to display variable values, checking for syntax errors, and utilizing error reporting functions like error_reporting(E_ALL) to catch any errors.

// Example of debugging incorrect date output
$date = "2022-05-10";
$new_date = date("Y-m-d", strtotime($date));
echo $new_date;
```

```php
// Example of debugging string replacement issue
$string = "Hello, World!";
$new_string = str_replace("World", "PHP", $string);
echo $new_string;