strncasecmp
(PHP 4 >= 4.0.2, PHP 5)
strncasecmp — Binary safe case-insensitive string comparison of the first n characters
Description
int strncasecmp
( string
$str1
, string $str2
, int $len
)This function is similar to strcasecmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.
Parameters
-
str1 -
The first string.
-
str2 -
The second string.
-
len -
The length of strings to be used in the comparison.
Return Values
Returns < 0 if str1 is less than
str2; > 0 if str1 is
greater than str2, and 0 if they are equal.
See Also
- strncmp() - Binary safe string comparison of the first n characters
- preg_match() - Perform a regular expression match
- substr_compare() - Binary safe comparison of two strings from an offset, up to length characters
- strcasecmp() - Binary safe case-insensitive string comparison
- stristr() - Case-insensitive strstr
- substr() - Return part of a string
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Коментарии
Example:
<?php
$string = “true”;
if(strncasecmp($string, “Trudeau”, 4)) { print “True”; } else { print "False" }
?>
If we look at above example, immediately we will say the final output will be 'False', but that's not real.
Method "strncasecmp()" returns 1 because the first four characters of ‘Trud’ come before the first four characters of "true" when sorted not case sensitively.
<?php
$str1 = "red";
$str2 = "redent";
$test=strncasecmp($str1, $str2 , 3);
if ($str1==$str2)
{
echo "$test";
}
else
{
echo "$test" ;
}
?>
if we run the above script then we will get return 0, because first string $str1 = "red" and second $str2 = "redent" but in comparison i have set the first three character will try to match. as per condition if two string are equal then it will return 0. But in below example it will return greater than 0 because here is str1 is greater than str2.
<?php
$str1 = "redmyshirt";
$str2 = "redent";
$test=strncasecmp($str1, $str2 , 4);
if ($str1==$str2)
{
echo "$test";
}
else
{
echo "$test" ;
}
?>
as same if we run the below script it will return -1 because str1 is less than str2.
<?php
$str1 = "red";
$str2 = "redent";
$test=strncasecmp($str1, $str2 , 4);
if ($str1==$str2)
{
echo "$test";
}
else
{
echo "$test" ;
}
?>
ya..i think its easy to understand