PHP string strcasecmp() function

Last Updated : 17 Mar 2025

PHP string strcasecmp() is predefine function. It is used to compare two given string. It is binary safe and case-insensitive. It is similar to the strncasecmp() function.

It returns:

If the two strings are equal: [ 0 ]
If string1 is less than string2: [< 0]
If string1 is greater than string2: > 0

Syntax:

Parameter	Description	Required/Optional
string 1	Specify first string to compare.	Required.
String2	Specify the second string to compare.	Reuired.

Example 1

<?php
$str1 = "JavaTPOINT";
$str2 = "JAVAtpoint";
echo "Your first string is:".$str1;
echo "<br>";
echo "Your second string is:".$str2;
echo "<br>";
echo strcasecmp("$str1","$str2");
?>

Output:

Your first string is:JavaTPOINT
Your second string is:JAVAtpoint
0

Example 2

<?php
  echo "By using strcasecmp() function:".strcasecmp("Hello","HELLO");
  echo "<br>";
  echo "using strcasecmp() function:".strcasecmp("Hello","hELLo");
?>

Output:

By using strcasecmp() function:0
using strcasecmp() function:0

Example 3

<?php
echo strcasecmp("Hello PHP!","HELLO WORLD!");
//The two strings are equal
echo strcasecmp("Hello PHP!","HELLO");
echo "<br>";
// String1 is greater than string2
echo strcasecmp("Hello PHP!","HELLO WORLD! HELLO!"); 
// String1 is less than string2 
?>

Output:

-75
-7

Example 4

<?php
$str1 = "PHP";
$str2 = "PHP";
if (strcasecmp($str1, $str2) == 0) {
    echo '$str is equal to $vstr2 in a case-insensitive string comparison';
}
?>

Output:

$str is equal to $vstr2 in a case-insensitive string comparison

Reference:

http://php.net/manual/en/function.strcasecmp.php

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