PHP从字符串中获取特定的整数

Question

I want to extract the ID which is the first integer in the string below:

ID:40021223
CSQ(0-31): 31
Online

I only want the to get 40021223

Answer 1

$str = 'ID:40021223';   //pass any string
echo $output = getID($str); 

function getID($str) {
   $res = explode(':',$str);  //split string with :
   if(in_array('ID',$res)) {  //if array contain Id then it will give the exact output else null
      return $res[1];
   } else {
      return null;
   }
}