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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
As in C, variables may be cast to a specific type by prefixing the type in parentheses. PHP treats newlines as whitespace, in the manner of a free-form language. The concatenation operator is . (dot). Array elements are accessed and set with square brackets in both associative arrays and indexed arrays.
See also: the {{}} template. The #if function selects one of two alternatives based on the truth value of a test string. {{#if: test string | value if true | value if false}} As explained above, a string is considered true if it contains at least one non-whitespace character.
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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.
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By writing {{if empty|a|b|c}} instead of {{#if:a|a|{{#if:b|b|c}}}}, expression a and b do not have to be repeated and evaluated twice. The template provides a fallback order, similar to a try catch based "It is easier to ask for forgiveness than permission" ( EAFP ) programming style.
This is a documentation subpage for Module:If empty. It may contain usage information, categories and other content that is not part of the original module page. This module can only be edited by administrators because it is transcluded onto one or more cascade-protected pages.