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PHP Quiz PHP CertificatePHP strnatcasecmp() Function
Example
Compare two strings using a "natural" algorithm (case-insensitive):
<?php
echo strnatcasecmp("2Hello world!","10Hello WORLD!");
echo "<br>";
echo strnatcasecmp("10Hello world!","2Hello WORLD!");
?>
echo strnatcasecmp("2Hello world!","10Hello WORLD!");
echo "<br>";
echo strnatcasecmp("10Hello world!","2Hello WORLD!");
?>
Run example »
Definition and Usage
The strnatcasecmp() function compares two strings using a "natural" algorithm.
In a natural algorithm, the number 2 is less than the number 10. In computer sorting, 10 is less than 2, because the first number in "10" is less than 2.
Note: The strnatcasecmp() is case-insensitive.
Syntax
strnatcasecmp(string1,string2)
| Parameter | Description |
|---|---|
| string1 | Required. Specifies the first string to compare |
| string2 | Required. Specifies the second string to compare |
Technical Details
| Return Value: | This function returns:
|
|---|---|
| PHP Version: | 4+ |
More Examples
Example 1
Difference between natural algorithm (strnatcmp) and regular computer string sorting algorithms (strcmp):
<?php
$arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200");
echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");
print_r($arr1);
echo "<br>";
echo "Natural order string comparison"."<br>";
usort($arr2,"strnatcmp");
print_r($arr2);
?>
$arr1 = $arr2 = array("pic1","pic2","pic10","pic01","pic100","pic20","pic30","pic200");
echo "Standard string comparison"."<br>";
usort($arr1,"strcmp");
print_r($arr1);
echo "<br>";
echo "Natural order string comparison"."<br>";
usort($arr2,"strnatcmp");
print_r($arr2);
?>
Run example »
Complete PHP String Reference
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