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Bug #5745 strpos returns false if match on first character
Submitted: 2000-07-23 12:18 UTC Modified: 2000-07-23 12:20 UTC
From: steve at srtware dot com Assigned:
Status: Closed Package: Misbehaving function
PHP Version: 4.0.1pl2 OS: Windows 98 SE
Private report: No CVE-ID: None
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From: steve at srtware dot com
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 [2000-07-23 12:18 UTC] steve at srtware dot com 
if (strpos('abcde', 'abc')) {
(...)

will evaluate as false since the value returned is zero.  The documentation says it will return false if the string is not found.

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 [2000-07-23 12:20 UTC] stas at cvs dot php dot net 
Yes it returns zero. It is not a bug. Use another condition to detect "not found" case.
 
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