PHP输出分析

Question

<?php
    $data="98.8degrees"; 
    (double)$data; 
    (int)$data; 
    (string)$data; 
    echo $data; 
?>

I was surprised/confused when the actual output was 98.8 degrees

I thought when $data uses (double), it converts to 98.8. Then when moving to (int), it becomes 98 and forth But I guess my analogy is wrong. Can someone explain to me how the output became like that?

Answer 1

You keep casting it, but turn around and discard the results. The value in $data never changes. Try the settype() function.