The strcmp Function
The strcmp function performs a binary-safe, case-sensitive string comparison. It returns 0 if the strings are identical, a negative number if the first string is less than the second, and a positive number if the first string is greater than the second.
Syntax
strcmp(string $str1, string $str2): int
Example
Comparison of identical strings:
<?php
$res = strcmp("Hello", "Hello");
echo $res;
?>
Code execution result:
0
Example
Comparison of different strings (case-sensitive):
<?php
$res = strcmp("Apple", "apple");
echo $res;
?>
Code execution result (negative number because 'A' < 'a' in ASCII):
-32
Example
Usage in conditional statements:
<?php
$password = "Secret123";
if (strcmp($password, "Secret123") === 0) {
echo "Password is correct";
} else {
echo "Password is incorrect";
}
?>
Code execution result:
"Password is correct"
See Also
-
the
strcasecmpfunction,
which compares strings case-insensitively -
the
strncmpfunction,
which compares the first n characters of strings
