Chris schreef:
if (stripos(strrev($file), "gpj.") === 0) {
echo $file; }
note the ===, 3 equals signs here is very important! check the docs
for why.
== means 'equals', and === means 'is identical to'.
Seems like they would do the same thing when comparing '0' to 'the
position in the string where that substr is found'. Why not?
0 can mean false in php:
indeed, php is dynamically typed and happily auto-casts all of the place
without issue ... this can bite you in the ass if your not aware of how
php auto-casts various types, and which types have precendence.
the manual should help, additionally test your assumptions regularly on the cmdline
with snippets like:
php -r ' var_dump(("" == false), (1 == "1"), ("two" == 1), ("two" == false));'
using === o test equality force type to be checked as well as 'content' of
the given LH and RH expressions.
$found = 0;
....
if (!$found) {
echo "File not found";
}
If a substr comparison matches at char 0:
$string = '12345';
$pos = substr($string, '1');
then without the '===' it would give the wrong result as $pos would be
converted to false in this example.
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