strcasecmp(): Case insensitive string comparison

echo strcasecmp("Hello world","HELLO WORLD"); // Output is 0

• 0 : if both strings are equal or matching
• < 0 : if string 1 is less than string 2
• > 0 : if string 1 is greater than string 1

$str1="Hello World";
$str2="hello world";
echo strcasecmp($str1,$str2); // Output is 0 
if(strcasecmp($str1,$str2)==0){
echo "Both strings are matching";
}else{
echo "Both strings are different ";
}

Both strings are matching

$str1="Hello";
$str2="hello world";
echo strcasecmp($str1,$str2);  // Output is -6
if(strcasecmp($str1,$str2)==0){
echo "Both strings are matching";
}else{
echo "Both strings are different ";
}

Both strings are different 

$str1="Hello World";
$str2="hello";
echo strcasecmp($str1,$str2);  // Output is 6
if(strcasecmp($str1,$str2)==0){
echo "Both strings are matching";
}else{
echo "Both strings are different ";
}

Both strings are different 

Example: Case-Sensitive vs Case-Insensitive Comparison

$str1 = 'Apple';
$str2 = 'apple';
echo strcmp($str1, $str2);  // Output: -1  Non-zero (case-sensitive)
echo strcasecmp($str1, $str2);  // Output: 0 (case-insensitive)

Example: Handling Empty Strings

$str1 = '';
$str2 = 'test';
echo strcmp($str1, $str2);  // Output: -1

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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