Where could the error be located in the PHP code provided in line 55?

The error in the PHP code provided in line 55 could be located in the incorrect use of the concatenation operator. If the intention is to concatenate the variable `$username` with the string ' logged in', the correct concatenation operator in PHP is a period (.) not a plus sign (+). To fix this issue, the concatenation operator should be changed to a period. 

// Incorrect concatenation operator (+) used in line 55
$message = $username + ' logged in';

// Correct concatenation operator (.) to concatenate the variable $username with the string ' logged in'
$message = $username . ' logged in';

Keywords

PHP code error debugging line 55 troubleshooting

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