PHP function strncmp() for string comparison of the first n characters (case sensitive)

Example

Compare two strings (case sensitive):

<?php
echo strncmp("Hello world!","Hello earth!",6);
?>

Definition and usage

strncmp() Function Compare two strings (case sensitive).

Note: strncmp() is binary safe and case-sensitive.

Tips: This function is similar to the strcmp() function, except that strcmp() does not have a length parameter.

Syntax

strncmp(string1,string2,length)

Parameters	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 per string used for comparison.

Technical details

##PHP version: More Multiple instances

Return value:	This function returns: 0 - if the two strings are equal ##<0 - if string1 is less than string2 >0 - if string1 Greater than string2
4+

Example 1

Compare two strings (case-sensitive, Hello and hELLo output are different):

<?php
echo strncmp("Hello","Hello",6);
echo "<br>";
echo strncmp("Hello","hELLo",6);
?>

Example This example uses the strncmp function to compare the specified length String.

int main()
{
  char str1[]="Hello",str2[]="Help",str3[]="Hello";
  int a,b,c;
  a = strncmp(str1,str2,3);    //比较字符串str1,str2前3个字符
  b = strncmp(str2,str3,4);     //比较字符串str2,str3前4个字符
  c = strncmp(str1,str2,4);     //比较字符串str1,str2前4个字符
  cout<<a<<"\t"<<b<<"\t"<<c<<"\n";
}

Run result:

0 1 -1

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