PHP uses a "natural" algorithm to compare two strings (case-sensitive) function strnatcmp ()

Parameter instance

Use the "natural" algorithm to compare two strings (case-sensitive):

<?phpecho strnatcmp ("2Hello world!", "10Hello world!"); echo "<br>", Echo strnatcmp ("10Hello world!", "2Hello world!"); >

Definition and usage

The strnatcmp () function uses a "natural" algorithm to compare two strings (case-sensitive).

In natural algorithms, the number 2 is less than the number 10. In computer sequencing, 10 is less than 2, because the first number in 10 is less than 2.

Note: The function is case-sensitive.

Grammar

STRNATCMP (STRING1,STRING2)

Parameters	Describe
String1	Necessary. Specifies the first string to compare.
string2	Necessary. Specifies a second string to compare.

technical details

return value:	This function returns: 0-if two strings are equal <0-if string1 is less than string2 >0-if string1 is greater than string2
php version:	4+

More examples

Example 1

The difference between the natural algorithm (STRNATCMP) and the regular computer string sorting algorithm (strcmp):

<?PHP$ARR1 = $arr 2 = Array ("Pic1", "Pic2", "PIC10", "pic01", "pic100", "Pic20", "Pic30", "pic200"); echo "Standard string Comparison "." <br> "; Usort ($arr 1," strcmp ");p Rint_r ($arr 1); echo" <br> "; echo" Natural order string comparison "." <br> "; Usort ($arr 2," strnatcmp ");p Rint_r ($arr 2);? >

Case

<?phpecho strnatcmp ("2Hello world!", "10Hello world!"); echo "<br/>"; Echo strnatcmp ("10Hello world!", "2Hello world!"); >

The output of the code above would be:

The above code will output the following result:-1 1