What is the issue with commenting out code using // in PHP version 8.1?

In PHP version 8.1, commenting out code using // within a block of code can cause syntax errors due to the introduction of a new feature called "trailing commas in parameter lists." To solve this issue, you can either use /* */ for block comments or ensure that the // comment is placed outside of the block of code. 

// Example of commenting out code using block comments
/*
$variable1 = 'value1',
$variable2 = 'value2',
$variable3 = 'value3',
*/

// Example of commenting out code outside of the block
$variable1 = 'value1',
$variable2 = 'value2',
$variable3 = 'value3', // This line is commented out

Keywords

PHP 8.1 commenting code // issue

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