What are some recommended resources for learning more about formatting float variables in PHP?

When working with float variables in PHP, it is important to format them properly to display the desired number of decimal places or to add thousands separators. One way to achieve this is by using the number_format() function in PHP. This function allows you to specify the number of decimal places, thousands separator, and decimal point character for a float variable.

```php
$floatVar = 1234.56789;
$formattedVar = number_format($floatVar, 2, '.', ',');
echo $formattedVar; // Output: 1,234.57
```

In the code snippet above, we have a float variable $floatVar with the value 1234.56789. We use the number_format() function to format this variable with 2 decimal places, a comma as the thousands separator, and a dot as the decimal point. The resulting formatted variable is then echoed out, displaying "1,234.57".