Description:
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As of 7.4 nested ternary operators without explicit parentheses are supposed to be deprecated. 
However, this is only true with the following syntax:

$test = $cond1 ? 1 : $cond2 ? 2 : 3; // Raises warning
$test = $cond1 ? 1 : ( $cond2 ? 2 : 3 ); // Documented correct syntax https://www.php.net/manual/en/migration74.deprecated.php

If the secondary condition is nested within the first condition's true expression no warning or error is raised


$test = $cond1 ? $cond2 ? 1 : 2 : 3; // No warning or error.

$cond1 = true & $cond2 = true returns 1
$cond1 = true & $cond2 = false returns 2
$cond1 = false returns 3


Test script:
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$test = true ? true ? 1 : 2 : 3;
echo $test;

Expected result:
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For 7.4
Deprecated: Unparenthesized `a ? b : c ? d : e` is deprecated. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` in /in/V9r8u on line 1

For 7.8
Fatal error: Unparenthesized `a ? b : c ? d : e` is not supported. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` in /in/V9r8u on line 1

Actual result:
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No warning or error