Description:
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The problem is when a float cast it's applied to a variable.

Does not matter what is the value of that variable, is_int() will always return a False result.


Test script:
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$num  = (float)2; //it's the same result for 0, 2, 2.0 or 2.3
$isint = is_int($num);
var_dump ($num);
var_dump($isint);

You get:

float(2)
bool(false)