Why does PHP in "interactive shell" mode only run this script once?

Question

The first time I paste this little test for loop in PHP interactive shell mode (php -a from the command line), it runs perfectly.

for($weekday == 0;  $weekday<7; $weekday++) { echo $weekday; }

Then I try pasting it and running it again a few times, it never returns any output. Why does it work the first time and do nothing after that?

Output:

And php -v returns PHP 7.1.1 (cli) (built: Jan 23 2017 15:09:57) ( NTS )

UPDATE: yes, I am stupid and used the comparison operator instead of the assignment operator. Dur. :-) But still, my original question is valid: WITH the comparison operator (as seen above), even though it is not exactly doing what I want it to do, why does it only execute once?

John Kugelman · Accepted Answer · 2018-09-17 12:50:42Z

3

Change the == to = to reset $weekday back to 0 each time.

for($weekday = 0;  $weekday<7; $weekday++) { echo $weekday; }

Otherwise, the second time it runs $weekday is already 7 and the loop condition fails immediately.

edited Sep 17, 2018 at 12:50

answered Sep 17, 2018 at 12:46

John Kugelman

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