[PHP-BUG] Req #75233 [NEW]: want a new opperator ?=

From:             uukoo at 163 dot com
Operating system: 
PHP version:      7.2.0RC2
Package:          PHP Language Specification
Bug Type:         Feature/Change Request
Bug description:want a new opperator ?=

Description:
------------
what we have
$a?:$b ==== $a?$a:$b
$a??$b ==== isset($a)?$a:$b

what we want
$a?=$b ==== isset($a)?$a:($a=$b)



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Edit bug report at https://bugs.php.net/bug.php?id=75233&edit=1
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Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=75233&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=75233&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=75233&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=75233&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=75233&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=75233&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=75233&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=75233&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=75233&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=75233&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=75233&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=75233&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=75233&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75233&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=75233&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=75233&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=75233&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=75233&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=75233&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=75233&r=mysqlcfg