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} extracts a specified template's parameters and performs a variety of tasks to aid in its documentation or WP:TFD merge nominations. It itself takes two parameters: |1=, the output format; and |base=, the title of a template. The compare function requires a third parameter, |other=. {} must always be substituted. Its usage is demonstrated below.
The language inside templates is the same language as regular wiki markup, but template writers tend to use the more complex available functions such as #if: statements. See Wikipedia's Help:Template and Wikimedia's mw:Help:Template , including all of "advanced functioning" help pages listed toward the bottom of that page .
For including parser functions, variables and behavior switches, see Help:Magic words; For a guide to displaying mathematical equations and formulas, see Help:Displaying a formula; For a guide to editing, see Wikipedia:Contributing to Wikipedia; For an overview of commonly used style guidelines, see Wikipedia:Simplified Manual of Style
It allows external document generators like phpDocumentor, which is the de facto standard implementation, [1] to generate documentation of APIs and helps some IDEs such as Zend Studio, NetBeans, JetBrains PhpStorm, ActiveState Komodo Edit and IDE, PHPEdit and Aptana Studio to interpret variable types and other ambiguities in the loosely typed ...
If a parameter is not specified in the template call, then the parameter reference is not replaced with anything -- it is expanded literally; this means that if the template call does not specify the parameter "xxx", the wikitext {{{xxx}}} inside the template expands to literally {{{xxx}}} (not the null string you may have expected). You can ...
This parser function can be used to detect whether a template parameter is defined, even if it has been set to a false value. For example, to check whether the first positional parameter has been passed to a template (note that the strings " + " and " - " can be any two different non-whitespace strings):
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PHP 5 introduced type declarations that allow functions to force their parameters to be objects of a specific class, arrays, interfaces or callback functions. However, before PHP 7, type declarations could not be used with scalar types such as integers or strings. [71] Below is an example of how PHP variables are declared and initialized.