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Hàm strcasecmp() trong PHP

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

Tác dụng của hàm strcasecmp()

The strcasecmp() function compares two strings.

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

strcasecmp(string1, string2);

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

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

// Test if both strings are equal
if(strcasecmp($str1, $str2) === 0) {
    echo "The two strings are equal in a case-insensitive comparison.";
}
?>

Parameters

The strcasecmp() 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 strcasecmp() 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 strcasecmp($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 strcasecmp($str1, $str2);
?>

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