Are there any potential compatibility issues with using substr_count() in PHP 5.3?

The substr_count() function in PHP 5.3 may have potential compatibility issues if the third parameter is used to specify the start position of the search. To avoid any problems, it is recommended to explicitly set the third parameter to the length of the string being searched. This will ensure consistent behavior across different PHP versions.

// Using substr_count() with explicit third parameter to avoid compatibility issues
$string = "Hello, world!";
$substring = "o";
$count = substr_count($string, $substring, 0, strlen($string));
echo $count; // Output: 2