Online PHP editor | output for h6IYF

@ 2016-08-07T06:53:10Z

<?php

try {
    function hello_1(?string $whom): ?string {
        if ($whom !== null) {
            return "Hello $whom";
        }
    }
    
    var_dump(hello_1(null));
} catch (\Error $e) {
    echo $e->getMessage() . PHP_EOL;
}

/*try {
    function hello_2(?string $whom): ?string {
        if ($whom !== null) {
            return "Hello $whom";
        }
        return;
    }
    
    var_dump(hello_2(null));
} catch (\Error $e) {
    echo $e->getMessage() . PHP_EOL;
}

Fatal error: A function with return type must return a value (did you mean "return null;" instead of "return;"?) in /in/QRj2G on line 20
*/

try {
    function hello_3(?string $whom): ?string {
        if ($whom !== null) {
            return "Hello $whom";
        }
        return null;
    }
    
    var_dump(hello_3(null));
} catch (\Error $e) {
    echo $e->getMessage() . PHP_EOL;
}

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: hello_1(): Return value must be of type ?string, none returned NULL
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 7.1.0, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33: Return value of hello_1() must be of the type string or null, none returned NULL
Output for 5.6.0 - 5.6.24, 7.0.0 - 7.0.9: Parse error: syntax error, unexpected '?', expecting variable (T_VARIABLE) in /in/h6IYF on line 4
Process exited with code 255.

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