note 119992 added to function.strncmp
| From: | salehrezq at gmail dot com | Date: | Thu, 06 Oct 2016 03:42:13 +0000 |
| Subject: | note 119992 added to function.strncmp | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-206781@lists.php.net to get a copy of this message | ||
A note not included in the documentation:
int strcmp ( string $str1 , string $str2 )
Returns < 0 if str1 is less than str2; > 0 if str1 is greater than str2, and 0 if they are
equal.
My addendum:
If str1 and str2 are not equal, and str1 is a sub-string of str2 or vise versa. The returned int
value will be negative or positive indicating how many characters the difference is between the two
strings in absolute terms.
Example:
<?php
$str1 = "phpaaa";
$str2 = "php";
echo strcmp($str1, $str2); // 3
?>
since str2 = "php" is a sub-string of str1 = "phpaaa" and "phpaaa" is
greater than "php" the returned value is positive and is 3 indicating how many characters
the difference is between the two strings.
If you replace the value of str1 with str2 the result will be -3 (negative) but still indicates the
absolute difference which is 3
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