Search results
Results from the WOW.Com Content Network
PHP has hundreds of base functions and thousands more from extensions. Prior to PHP version 5.3.0, functions are not first-class functions and can only be referenced by their name, whereas PHP 5.3.0 introduces closures. [35] User-defined functions can be created at any time and without being prototyped. [35]
One common use example is searching a multi-dimensional table. This can be done either via multilevel breaks (break out of N levels), as in bash [12] and PHP, [13] or via labeled breaks (break out and continue at given label), as in Go, Java and Perl. [14]
foreach is usually used in place of a standard for loop statement. Unlike other for loop constructs, however, foreach loops [1] usually maintain no explicit counter: they essentially say "do this to everything in this set", rather than "do this x times". This avoids potential off-by-one errors and makes code simpler to read.
For loop illustration, from i=0 to i=2, resulting in data1=200. A for-loop statement is available in most imperative programming languages. Even ignoring minor differences in syntax, there are many differences in how these statements work and the level of expressiveness they support.
In some cases this is importing the exported functionality of a library, package or module but some mechanisms are simpler text file include operations. Import can be classified by level (module, package, class, procedure,...) and by syntax (directive name, attributes,...). File include
The next example illustrates a PHP class that implements the Traversable interface, which could be wrapped in an IteratorIterator class to act upon the data before it is returned to the foreach loop. The usage together with the MYSQLI_USE_RESULT constant allows PHP scripts to iterate result sets with billions of rows with very little memory usage.
Moreover, C++11 allows foreach loops to be applied to any class that provides the begin and end functions. It's then possible to write generator-like classes by defining both the iterable methods (begin and end) and the iterator methods (operator!=, operator++ and operator*) in the same class. For example, it is possible to write the following ...
In computer programming, a code smell is any characteristic in the source code of a program that possibly indicates a deeper problem. [1] [2] Determining what is and is not a code smell is subjective, and varies by language, developer, and development methodology.