What is causing the "Parse error" in the PHP code snippet provided?

The "Parse error" in the PHP code snippet is caused by missing semicolons at the end of each line inside the array declaration. To solve this issue, simply add semicolons at the end of each line inside the array declaration.

// Incorrect code snippet
$array = array(
    'apple',
    'banana'
    'orange'
);

// Corrected code snippet
$array = array(
    'apple',
    'banana',
    'orange'
);