extract numbers from a string in php

1$str = 'In My Cart : 11 items';
2$int = (int) filter_var($str, FILTER_SANITIZE_NUMBER_INT);

1phpCopy<?php 
2$string = 'Sarah has 4 dolls and 6 bunnies.';
3$outputString = preg_replace('/[^0-9]/', '', $string);  
4echo("The extracted numbers are: $outputString \n"); 
5?> 
6

1phpCopy<?php 
2$string = 'Sarah has 4 dolls and 6 bunnies.';
3$int = (int) filter_var($string, FILTER_SANITIZE_NUMBER_INT);  
4echo("The extracted numbers are: $int \n"); 
5?> 
6

1phpCopy<?php 
2$string = 'Sarah has 4 dolls and 6 bunnies.';
3preg_match_all('!\d+!', $string, $matches);
4print_r($matches); 
5?> 
6