Preg_replace_callback_array() function in PHP 7 represents a regular expression and replaces the use of callbacks. This function returns a string or an array of strings to match a set of regular expressions and replaces them using a callback function.Syntaxpreg_replace_callback_array(patterns, input, limit, count)Parameter Values:pattern − It requires an associate array to ... Read More

The concept of generator is not new to PHP 7, because it was available in the earlier versions too. With generators, implementation becomes easy without the overhead of implementing a class that implements the iterator interface. With the help of a generator, we can write foreach code without using an ... Read More

In the previous versions of PHP, generator functions were not able to return expressions, but from the PHP 5.5, generator return expression is added in the existing one. By using generator return expressions, it is easy to use the return statement within a generator and, it also returns the value ... Read More

PHP 7 uses three different types of Group Use declarations −Non-mixed-use declarationsMixed-use declarationsCompound use declarationsNon-mixed-use declarations:Non-mixed-use declaration means we do not use the classes, functions, and constructs in a single statement. Or, we can say that when we declare classes, functions, and constants separately using a use statement. It is ... Read More

In PHP 7, Group Use declaration is more readable and can be used to import classes, constants, and functions easily from the same namespace.Group Use declaration is used to import multiple structures easily from a namespace and cuts a good level of volubility in most cases. It is also useful ... Read More