note 17868 modified in function.fopen by goba
| From: | goba@php.net | Date: | Tue, 01 Jan 2002 14:34:27 +0000 |
| Subject: | note 17868 modified in function.fopen by goba | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-24032@lists.php.net to get a copy of this message | ||
Attn Perl Programmers:
If you are used to writing script like
do something || die("no can do");
note that in php || has a higher precedence than =
So, don't write:
$h = fopen("$filename", "r") || die("cannot open $filename");
b/c this will overwrite the file ptr!
Now, or has a lower precedence than || and is also lower than =
So, you may write:
$h = fopen("$filename","r") or die("cannot open $filename");
However, you may avoid the entire issue with code like this:
$h = fopen("$filename","r");
if (!$h) {
die("unable to open $filename");
}
--was--
Attn Perl Programmers:
If you are used to writing script like
do something || die("no can do");
note that in php || has a higher precedence than =
So, don't write:
$h = fopen("$filename", "r") || die("cannot open $filename");
b/c this will overwrite the file ptr!
Now, or has a lower precedence than || and is also lower than =
So, you may write:
$h = fopen("$filename","r") or die("cannot open $filename");
However, you may avoid the entire issue with code like this:
$h = fopen("$filename","r");
if (!$h) {
die("unable to open $filename");
}
http://www.php.net/manual/en/function.fopen.php