Does php can directly echo boolean true in browser?

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<?php

function show(){
$num=rand(0,1);
if ($num===1){
return true;
}
else
return false;

}
echo (boolean)show();
?>

even though I cast it to boolean it only show 1 when true.
But I read a php book which tell it works. This let me confused.
Thank you for your help.

Posted 7-Jan-14 7:10am

StevenLam123

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W∴ Balboos, *GHB* · Answer 1 · 2014-01-07T08:37:00

Solution 1

If your purpose is merely to echo the result, why not simply return 'true' and 'false' as strings ?

If you must return the value (which is 0 or 1), then change your ECHO to the following:

ECHO ((boolean)show()==1)?'true':'false';

Programming is at is best when you keep it simple.

Posted 7-Jan-14 8:37am

W∴ Balboos, GHB

Comments

Killzone DeathMan 8-Jan-14 10:29am

Yeah thats ok! :)
I think making an echo true will show "1" and echo false will show ""! Right? :P

W∴ Balboos, GHB 8-Jan-14 11:36am

The echo of 1 (or 0 for false) is his problem. False is 0 in all languages I happen to know of. Now, with .php, you do need to be a bit careful when testing for true/false. If you want to test for 0 or not 0, you can use '==', but if you really want to test for the boolean true and false, you need to use '===', which is php's test with typing. This handles comparisons to NULL, which may mess with your results.

He wishes the text output - so either his function can return a text string or he can trap the return value and ECHO whatever he wishes base upon true or false. I've don't know a language that uses a blank or empty string for false.

Killzone DeathMan 8-Jan-14 12:59pm

You are right that is better "===" to use, but what I desagree is when you run the code "<?php echo true; ?>", the page shows "1", and when you run "<?php echo false; ?>" it shows "" and not "0"! You are right, that FALSE is for all languages "0", but the PHP dont shows "0", it shows an empty string... I have tested it right now :P
But you are right, you have post a good solution ;)

W∴ Balboos, GHB 8-Jan-14 13:08pm

When you're right you're right.