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In PHP, you can extract numbers from a string using regular expressions and the preg_match_all() function. Here's an example of how to extract all numbers from a string:

$my_string = "There are 15 Oranges and 3 Bananas.";
preg_match_all('/[0-9]+/', $my_string , $matches);
print_r($matches[0]);

This will output:

Array ( [0] => 15 [1] => 3 )

Explanation:

• The regular expression /[0-9]+/ searches for one or more consecutive digits.
• The preg_match_all() function searches the string for all occurrences of the regular expression and stores the matches in the $matches array.
• The print_r() function is used to display the contents of the array.

You can also use the preg_replace() function to remove non-numeric characters from a string and keep only the numbers:

$string = "There are 15 Oranges and 3 Bananas.";
$numbers = preg_replace('/D/', '', $string);
echo $numbers;

This will output:

15 3

Explanation:

• The regular expression /D/ matches any non-digit character.
• The preg_replace() function replaces all non-digit characters with an empty string, effectively removing them from the string.

There is one another way to however it's not that reliable like above two options. We can use filter_var() PHP built-in function to extract int from string.

$string = "There are 15 Oranges and 3 Bananas.";
// extract numbers from string
$my_int = (int)filter_var($string ,FILTER_SANITIZE_NUMBER_INT);
echo $my_int;

This will output:

153