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

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