PHP strnatcmp () function
Examples
Using "natural" algorithm to compare two strings (case sensitive):
<?php
echo strnatcmp("2Hello world!","10Hello world!");
echo "<br>";
echo strnatcmp("10Hello world!","2Hello world!");
?>
echo strnatcmp("2Hello world!","10Hello world!");
echo "<br>";
echo strnatcmp("10Hello world!","2Hello world!");
?>
Running instance »
Definition and Usage
strnatcmp () function uses a "natural" algorithm to compare two strings (case-sensitive).
Natural algorithm, the number is smaller than the number 10. In the computer ordering, 10 is less than 2, because 10 is the first number in less than 2.
Note: This function is case-sensitive.
grammar
strnatcmp( string1,string2 )
| 参数 | 描述 |
|---|---|
| string1 | 必需。规定要比较的第一个字符串。 |
| string2 | 必需。规定要比较的第二个字符串。 |
technical details
| return value: | This function returns:
|
|---|---|
| PHP version: | 4+ |
More examples
Example 1
Nature algorithm (strnatcmp) and regular computer string sorting algorithms (strcmp) are different:
<?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);
?>
Running instance »
PHP String Reference