Are there any best practices or recommendations for updating PHP code from older versions to PHP 5?

When updating PHP code from older versions to PHP 5, it is important to address deprecated features and syntax changes. One common issue is the removal of the call-time pass by reference feature in PHP 5, which requires updating function calls to pass variables by reference using the '&' symbol. Additionally, older PHP code may use functions that have been deprecated or removed in PHP 5, requiring replacement with alternative functions or methods. 

// Before PHP 5
function foo(&$var) {
    $var++;
}

$bar = 1;
foo($bar);

// After PHP 5
function foo(&$var) {
    $var++;
}

$bar = 1;
foo($bar); // Update to pass variable by reference using &

Keywords

PHP 5 code migration deprecated functions backward compatibility error handling

Related Questions