Description:
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---
From manual page: http://www.php.net/function.ob-implicit-flush
---

The parameter type declaration of $flag is integer, but its default value is described as TRUE. Additionally the proposed values for $flag are TRUE and FALSE in the documentation.

According to the source https://github.com/php/php-src/blob/c61cea7135f882b9cddef4a7e1a6ce8d51fedd61/main/output.c#L1521 the parameter is defined as an integer.

When using strict_type mode and passing TRUE or FALSE a TypeError is thrown:

--
PHP Fatal error:  Uncaught TypeError: ob_implicit_flush() expects parameter 1 to be integer, boolean given
--

Tested on current PHP 7.0.23 and PHP 7.1.9 in CLI and FPM mode.

Test script:
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<?php declare(strict_types=1);

ob_implicit_flush(true);