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  2. Help:Conditional expressions - Wikipedia

    en.wikipedia.org/wiki/Help:Conditional_expressions

    But {{{1|}}} will evaluate to the empty string (a false value) because the vertical bar or pipe character, "|", immediately following the parameter name specifies a default value (here an empty string because there is nothing between the pipe and the first closing curly brace) as a "fallback" value to be used if the parameter is undefined.

  3. Template:If empty - Wikipedia

    en.wikipedia.org/wiki/Template:If_empty

    This returns the first of the parameters logo, image and picture that is defined and non-empty, otherwise "default.svg". Rationale The MediaWiki parameter default function doesn't return the default value for empty parameters.

  4. Module:If not given or empty - Wikipedia

    en.wikipedia.org/wiki/Module:If_not_given_or_empty

    final output is before EMPTY after. Text before and after is added because when contains EM (for empty). {{Infobox some thing|image=Green pog.svg}} final output is the equivalent of [[File:Green pog.svg|30px]]. Text before and after is not added because when does not contain NE (for not empty

  5. Help:Manipulating strings - Wikipedia

    en.wikipedia.org/wiki/Help:Manipulating_strings

    The simplest operation is taking a substring, a snippet of the string taken at a certain offset (called an "index") from the start or end. There are a number of legacy templates offering this but for new code use {{#invoke:String|sub|string|startIndex|endIndex}}. The indices are one-based (meaning the first is number one), inclusive (meaning ...

  6. Null coalescing operator - Wikipedia

    en.wikipedia.org/wiki/Null_coalescing_operator

    The null coalescing operator is a binary operator that is part of the syntax for a basic conditional expression in several programming languages, such as (in alphabetical order): C# [1] since version 2.0, [2] Dart [3] since version 1.12.0, [4] PHP since version 7.0.0, [5] Perl since version 5.10 as logical defined-or, [6] PowerShell since 7.0.0, [7] and Swift [8] as nil-coalescing operator.

  7. PHP syntax and semantics - Wikipedia

    en.wikipedia.org/wiki/PHP_syntax_and_semantics

    PHP generally follows C syntax, with exceptions and enhancements for its main use in web development, which makes heavy use of string manipulation. PHP variables must be prefixed by "$". This allows PHP to perform string interpolation in double quoted strings, where backslash is supported as an escape character.

  8. Template:Is empty - Wikipedia

    en.wikipedia.org/wiki/Template:Is_empty

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  9. Semipredicate problem - Wikipedia

    en.wikipedia.org/wiki/Semipredicate_problem

    Similarly, a function that normally returns a string might sometimes return the empty string as a valid response, but return false on failure. This process of type-juggling necessitates care in testing the return value: e.g., in PHP, use === (i.e., equal and of same type) rather than just == (i.e., equal, after automatic type conversion). It ...