计算字符串中出现的数字数量

Question

I was wondering if there's a combo of functions or a direct function that can count how many numbers appears in a string, without use a long-way as str_split and check every character in a loop.

From a string like:

fdsji2092mds1039m

It returns that there's 8 numbers inside.

Answer 1

You can use filter_var() with the FILTER_SANITIZE_NUMBER_INT constant, then check the length of the new string. The new string will contain only numbers from that string, and all other characters are filtered away.

$string = "j3987snmj3j";
$numbers = filter_var($string , FILTER_SANITIZE_NUMBER_INT);
$length = strlen($numbers); // 5
echo "There are ".$length." numbers in that string";

Note that each number will be counted individually, so 137 would return 3, as would 1m3j7.

Live demo