How to check with strpos if the result is a number or empty?

Question

Let's say my echo sometimes: 1234 And sometimes Empty.

Is there a possibility to check if its a number?

Or to check if the result is empty?

echo $check;

if(strpos($check, ' check-number/empty  ') !== false){
...to do...

Answer 1

我不完全了解您要做什么，但是要检查变量是否为数字，可以使用PHP内置函数is_numeric()

Answer 2

Check the value using an if-else statement to check if current value is null . Use is_numeric to check a value is a number.

Use this:

   if(is_numeric($check)){ 
        echo "I am a number"; 
   }

As is_numeric account if a value is null as well. All the best.