What are the common pitfalls to avoid when migrating PHP scripts from older versions to newer versions like PHP 5.3.5?

One common pitfall when migrating PHP scripts from older versions to newer versions like PHP 5.3.5 is the use of deprecated functions or features. To solve this issue, it is important to update the code to use modern alternatives that are supported in the newer PHP version. This may involve replacing deprecated functions with their updated counterparts or reworking code that relies on outdated features. Example: 

// Deprecated function in PHP 5.3.5
$oldResult = mysql_query($query);

// Updated code using mysqli in PHP 5.3.5
$mysqli = new mysqli($host, $username, $password, $database);
$newResult = $mysqli->query($query);

Keywords

Deprecated functions backward compatibility PHP 5.3.5 error reporting compatibility issues

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