How can the error "unexpected '[', expecting ',' or ';'" be resolved in PHP code?

To resolve the error "unexpected '[', expecting ',' or ';'" in PHP code, you need to ensure that array declarations are done correctly. This error typically occurs when an array is being defined incorrectly, such as missing commas between elements or using square brackets inappropriately.

// Incorrect array declaration causing the error
$array = [1, 2 3, 4];

// Correct array declaration with commas between elements
$array = [1, 2, 3, 4];