In this article, To get the list of all numbers in a String, use the regular expression ‘[0-9]+’ with re.findall() method. [0-9] represents a regular expression to match a single digit in the string. [0-9]+ represents continuous digit sequences of any length.

1. Code:

    <?php 
	
	function getAllDigitsInString($str) {
		preg_match_all('!\d+!', $str, $matches);
		return  implode('', $matches[0]);
	}
	$str = "Soltuts.com1234 providing PHP tutorials, tips, tricks";
	echo getAllDigitsInString($str);
    ?> 

2. Example:

Input:

string input: "Soltuts.com1234 providing PHP 5tutorials, tips, tricks"

Output:

output: 12345