Uncaught TypeError: Cannot read property ‘toUpperCase’ of undefined

Try this:

var getusername= ""+usernames[k];

If that doesn’t work, then this could be the problem:

Switch

for (var k = 0; k <= usernames.length; k++)

for

for (var k = 0; k <= usernames.length-1; k++)

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)