note 87868 added to function.strpos
| From: | jburns131 at jbwebware dot com | Date: | Sun, 28 Dec 2008 00:48:04 +0000 |
| Subject: | note 87868 added to function.strpos | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-148594@lists.php.net to get a copy of this message | ||
The Situation:
I wanted to return TRUE if strpos returned position 0, and only position 0, without the added
overhead of preg_match.
The Solution:
As PHP treats 0 (zero) as NULL, and strpos returns the int 0 (but not NULL), I used type casting and
the "===" comparison operator (as it compares types) to resolve my issue.
<?php
$hayStack = "dbHost";
$needle = "db"
$needlePos = strpos($hayStack, $needle);
if((string)$needlePos === (string)0) {
echo "db is in position zero";
} else {
echo "db is NOT in position zero";
}
?>
Returns:
db is in position zero
<?php
$hayStack = "another_db_host";
$needle = "db"
$needlePos = strpos($hayStack, $needle);
if((string)$needlePos === (string)0) {
echo "db is in position zero";
} else {
echo "db is NOT in position zero";
}
?>
This returns:
db is in NOT position zero
----
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Probable Submitter: 71.233.5.86
----
Manual Page -- http://www.php.net/manual/en/function.strpos.php
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