The strncmp() function in PHP compares whether the first two characters of two strings are equal, phpstrncmp_PHP tutorial

The strncmp() function in PHP compares the first two characters of two strings to see if they are equal. phpstrncmp

This article describes the strncmp() function in PHP to compare two characters. Method to check whether the first 2 characters of a string are equal. Share it with everyone for your reference, the details are as follows:

The strncmp() function in PHP is used to compare two strings (case-sensitive) and determine whether the first n characters of the two strings are equal.

strncmp() function is defined as follows:

strncmp(string1,string2,length)

Parameter description:

string1 required. Specifies the first string to compare.
string2 required. Specifies the second string to be compared.
length is required. Specifies the number of characters of each string used in the comparison.

Return value description:

If the two strings are equal, the return value is 0
If string1 is less than string2, the return value is less than 0
If string1 is greater than string2, the return value is greater than 0

Sample code is as follows:

<&#63;php
/* strncmp()函数比较两个字符串前n个字符是否相等
 *
 * 返回值：
 0 - 如果两个字符串相等
 <0 - 如果 string1 小于 string2
 >0 - 如果 string1 大于 string2
 */
 $str1="welcome to www.jb51.net";
 $str2="WELCOME TO WWW.JB51.NET";
 $str3="welcome to php";
 echo strncmp($str1,$str2,2);
 echo "<br/>";
 echo strncmp($str1,$str3,2);
&#63;>

The running results are as follows:

1
0

For more information on PHP string operations, please view the special topic on this site: "Summary of PHP String Usage"

I hope this article will be helpful to everyone in PHP programming.

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