从变量中提取第一个数字

Question

I have variables that always start with a number or numbers and need the script to determine where this number ends, now for an example the variable can be like the following:

1234-hello1.jpg

1 hello1.gif

1234hello1.gif

123456 hello1.gif

What I am trying to say is an explode function would not work, and my regex is very poor, I just need to be left with the first number and ignore any other number in the string. I just need to be left with the number(s) in bold.

Thanks in advance...

Answer 1

$arr = str_split($str);
for($i = 0; $i < count($arr); ++$i){
   if(!is_numeric($arr[$i])){
       echo "Number ends at index: " . $i;
       break;
   }
}

You could also put the numbers into an array using $arr[$i] if you so wish. This is probably a lot more readable than using regex.

You could add logic to allow one decimal point but from the question it seems you only want integers.

http://sandbox.onlinephpfunctions.com/code/fd21437e8c1502b56572a624cf6e4683cf483a8d - Example of working code