Today’s afternoon, I wrote an aimless code of PHP, that’s a good way to waste time I think. Then I created a simple line, and I assume the codes was wrong. But when I run the code, its output  amazes me. The simple codes is:

<?php
print 1…1;
?>

The output is “10.1″, I have in mind some doubts which really puzzle me. Why is that? And I wrote more codes to try it:

<?php
print 1.1;    // The output is 1.1, one dot, the result is really clearly
print 1..1;   // Wrong, two dot, error clearly
print 1…1;  // 10.1
print 1….1; // Wrong, four dot, yeah, error of course
print 2…2;  // 20.2
print 6…3;  // 60.3
?>

Only three dots mixed me up more, there is no the “three dots” operator in PHP language. So I wrote more testing codes:

<?php
$first=7;
$last=6;
print $first…$last;        // Output is 70.6
print ($first.).(.$last);    // Output is 70.6 too, em, I think its nearly the answer…
print ($first.);               // wrong
print 7.;                       // wrong
// oh, no, I think I don’t know why…
?>

Last now, I still don’t know why this is. So, I submit it on PHP community and hope to get the question’s answer. If you know, please tell me, thank you.