PHP 8 reference · String Functions

PHP strcasecmp() Function

Compare two strings without caring about ASCII upper and lower case. Returns 0 if they match.

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Syntax

strcasecmp(string $string1, string $string2): int

Parameter	Description
`string1`	The first string.
`string2`	The second string.

0 if equal ignoring case; negative or positive otherwise.

Ignore caseTry it yourself

<?php
var_dump(strcasecmp("Hello", "hello") === 0);
var_dump(strcasecmp("apple", "Banana") < 0);

Output

bool(true)
bool(true)

Case-insensitive sortTry it yourself

<?php
$cities = ["paris", "Berlin", "amsterdam"];
usort($cities, "strcasecmp");
print_r($cities);

Output

Array
(
    [0] => amsterdam
    [1] => Berlin
    [2] => paris
)

Version	Change
PHP 4.0	Added

strcmp() · Compare two strings byte by byte, case-sensitively. Returns 0 when equal, less than 0 or more than 0 otherwise.
strnatcasecmp() · Compare strings in natural order ("a2" before "a10") while ignoring upper and lower case.
PHP Strings · tutorial