Description:
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One can use an if/then/else construct to conditionally assign a reference to a variable. However, the more compact/readable assignment by means a ternary operator, rejects the "&" before the variable.

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

$myArray = array( [ 'pear', 'sweet' ], [ 'orange', 'sour' ] );

if ( isset( $myArray [5] ) )
    $entryRef = &$myArray [5];
else
    $entryRef = &$myArray [1];
echo $entryRef[1];  // works

// Syntax error:
$entryRef = isset( $myArray [5] ) ? &$myArray[5] : &$myArray[1];

Expected result:
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$entryRef = &$variable; 
is a valid assignment - so it seems counterintuitive for the similar assignment

$entryRef = condition ? &$variable1 : NULL;
to be "invalid syntax".

Actual result:
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PHP Parse error:  syntax error, unexpected '&'