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Hàm strcmp() trong PHP

Hướng dẫn cách sử dụng hàm strcmp() trong lập trình PHP

Tác dụng của hàm strcmp()

The strcmp() function compares two strings.

This function is case-sensitive. For case-insensitive searches, use the strcasecmp() function.

The following table summarizes the technical details of this function.

Return Value: Returns a negative value (< 0) if string1 is less than string2; a positive value (> 0) if string1 is greater than string2, and 0 if both strings are equal.
Version: PHP 4+

Syntax

The basic syntax of the strcmp() function is given with:

strcmp(string1, string2);

The following example shows the strcmp() function in action.

<?php
// Sample strings
$str1 = "Hello";
$str2 = "HELLO";

// Test if both strings are equal
if(strcmp($str1, $str2) !== 0) {
    echo "The two strings are not equal in a case-sensitive comparison.";
}
?>

Parameters

The strcmp() function accepts the following parameters.

Parameter Description
string1 Required. Specifies the first string to compare.
string2 Required. Specifies the second string to compare.

More Examples

Here're some more examples showing how strcmp() function actually works:

The following example compares two strings where the first string is less than the second.

<?php
// Sample strings
$str1 = "Hello";
$str2 = "Hello John!";

// Comparing the two strings
echo strcmp($str1, $str2);
?>

The following example compares two strings where the first string is greater than the second.

<?php
// Sample strings
$str1 = "Hello Peter!";
$str2 = "Hello";

// Comparing the two strings
echo strcmp($str1, $str2);
?>

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