PHP determines whether two strings are the same

php determines whether two strings are the same

The 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 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.

The sample code is as follows:

<?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);
?>

Running result:

1
0

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