What potential issues can arise when migrating from PHP 5.2 to PHP 5.3 in a website or application?

One potential issue when migrating from PHP 5.2 to PHP 5.3 is the deprecation of the "call-time pass-by-reference" feature, where functions cannot be called with references anymore. To solve this, you need to remove the ampersand (&) symbol before the variable in the function call. 

// Before PHP 5.3
function foo(&$var) {
    $var++;
}

$bar = 1;
foo(&$bar);

// After PHP 5.3
function foo($var) {
    $var++;
}

$bar = 1;
foo($bar);

Keywords

PHP 5.2 PHP 5.3 backward compatibility deprecated functions error handling

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