If

PHP: if - Manual

www.php.net/manual/ru/control-structures.if.php

You can have 'nested' if statements withing a single if statement, using additional parenthesis. For example, instead of having Any variables defined inside the if block will be available outside the block. Remember that the if doesn't have its own scope.

if - Wiktionary

en.wiktionary.org/wiki/if

From Middle English if, yif, yef, from Old English ġif ("if"), from Proto-Germanic *jabai ("when, if"). Cognate with Scots gif ("if, whether"), Saterland Frisian af, of ("if, whether"), West Frisian oft ("whether"), Dutch of ("or, whether, but"), Middle Low German ef, if, af, of...

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