Comparing String to Integer gives strange results

Question

I\'m really confused as to why this operation works. Can someone explain it?

$test1 = \"d85d1d81b25614a3504a3d5601a9cb2e\";
$test2 = \"3581169b064f71be1630b         


        

Answer 1

I've been using some conversions and comparisons to test if a numeric string is a number:

$test1="19de6a91d2ca9d91721d82f1bd8102b6";
   echo (float)$test1==$test1; //TRUE
   echo is_float($test1); //FALSE

   //Converting the string to float and then converting it to string and compare will do the trick 
   echo (string)((float)$test1)==(string)$test1; //FALSE


$test2="5.66";
   echo (float)$test2==$test2; //TRUE

   //Testing the numeric string using `is_float` wont give the expected result
   echo is_float($test2); //FALSE

   echo (string)((float)$test2)==(string)$test2; //TRUE