Online PHP editor | output for 6XMc4

@ 2017-01-19T10:48:13Z

<?php

function getusername($user)
{
    return 'genericUser';
}

function test ($user) 
{
    {  // original question 
        $usernameA = $user ?: getusername($user);
        
        echo '$usernameA = ', var_export($usernameA, true), PHP_EOL;
    }

    { // equivalent 
        if( $user )
        {
            $usernameB = $user; 
        } 
        else
        {     
            $usernameB = getusername($user); 
        }
        
        echo '$usernameB = ', var_export($usernameB, true), PHP_EOL;
    }
}


$testCases = array('someUser', true, '', null, false, 0, @$undefined);
foreach ( $testCases as $testCase ) 
{
    echo 'test with ', var_export($testCase , true) ,' ...', PHP_EOL;
    test($testCase);
    echo 'test with ', var_export($testCase , true) ,' DONE.', PHP_EOL;
    echo PHP_EOL;
}

Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1 - 8.4.2: test with 'someUser' ... $usernameA = 'someUser' $usernameB = 'someUser' test with 'someUser' DONE. test with true ... $usernameA = true $usernameB = true test with true DONE. test with '' ... $usernameA = 'genericUser' $usernameB = 'genericUser' test with '' DONE. test with NULL ... $usernameA = 'genericUser' $usernameB = 'genericUser' test with NULL DONE. test with false ... $usernameA = 'genericUser' $usernameB = 'genericUser' test with false DONE. test with 0 ... $usernameA = 'genericUser' $usernameB = 'genericUser' test with 0 DONE. test with NULL ... $usernameA = 'genericUser' $usernameB = 'genericUser' test with NULL DONE.

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