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strcmp() compares two strings and gives -1, 0 or 1 depending on wheather the first string is "smaller", equal to or greater than the second one.

< ?php
echo strcmp('aa','bb'); // prints -1
echo strcmp('bb','bb'); // prints 0
echo strcmp('zz','yy'); // prints 1
?>

Thus being said there's an error in the php certification guide that explains the strcasecmp() function, which is the same as strcmp() only case insensitive. There is a snippet in the book that goes like:
< ?php
$a = 'hello';
if (strcasecmp($a, 'HELLO')) {
echo 'the same';
}?>
The book says that the echo will be executed but it will not, as the comparison will return 0, since 'hello' and 'HELLO' are the same string when regarded at case-insensitively.

This entry was posted on Tuesday, March 29th, 2005 and is filed under PHP certification. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.