What are common pitfalls when converting PHP code from version 5 to version 7?

One common pitfall when converting PHP code from version 5 to version 7 is the removal of deprecated features such as the use of the "new" keyword with a class name that is not a variable. To solve this, you should ensure that class names are always provided as variables. 

// Before PHP 7
$instance = new ClassName;

// After PHP 7
$className = 'ClassName';
$instance = new $className;

Keywords

backward incompatible changes deprecated features type declarations error handling performance improvements

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