PHP weird error with empty() function

Question

I uploaded a project from localhost to remote server and it didn't work. I found out that these lines are causing the error

if(!empty(ltrim(rtrim($string)))){
    $default_value = $string;
}

Then I have changed it to

$string = ltrim(rtrim($string));
if(!empty($string)){
    $default_value = $string;
}

And it's working. What is causing the error ?

No error is shown, only blank page. Changing ltrim(rtrim($string)) to just trim($string) doesn't help.

1. What is causing the error ? What error? 2. right and left trim combine it to a simple trim() call! — Rizier123
– Rizier123, Commented Apr 13, 2015 at 10:49
Why do both ltrim() and rtrim() when you can simply do trim() instead? — Mark Baker
– Mark Baker, Commented Apr 13, 2015 at 10:49
@MarkBaker I think because, he thinks that trim() also removes whitespace between 2 words. — Daan
– Daan, Commented Apr 13, 2015 at 10:52
What version of PHP are you using though? There were changes made to PHP 5.5.0 that allowed the results of expressions to be passed to empty: prior to that, you had to pass a variable — Mark Baker
– Mark Baker, Commented Apr 13, 2015 at 10:52

Carlos · Accepted Answer · 2015-04-13 11:03:59Z

1

Until PHP 5.5 empty() only expected variables and from then on it also works with expressions. You must have PHP 5.5+ and your server runs a lower version.

Source: http://php.net/manual/en/function.empty.php

answered Apr 13, 2015 at 11:03

Carlos

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