Bug #79193 [Opn]: 7.3 -> 7.4 broke `self::$field =& $field`, now `isset( $field['name'] )` false

Edit report at https://bugs.php.net/bug.php?id=79193&edit=1 ID: 79193 Updated by: nikic@php.net Reported by: leho at conversionready dot com Summary: 7.3 -> 7.4 broke self::$field =& $field, now isset( $field['name'] ) false Status: Open Type: Bug Package: opcache Operating System: Linux PHP Version: 7.4.2 -Assigned To: +Assigned To: nikic Block user comment: N Private report: N New Comment: Looks like a type inference bug. Previous Comments: ------------------------------------------------------------------------ [2020-01-29 22:04:19] requinix@php.net Yup. ------------------------------------------------------------------------ [2020-01-29 21:44:43] leho at conversionready dot com Good call! opcache.enable = 0 also makes this problem disappear. Time to reassign Package -> Opcache? ------------------------------------------------------------------------ [2020-01-29 21:33:59] requinix@php.net Any difference if you disable opcache? ------------------------------------------------------------------------ [2020-01-29 20:45:14] leho at conversionready dot com Interestingly, isset( self::$field['name'] ); // true ------------------------------------------------------------------------ [2020-01-29 20:38:03] leho at conversionready dot com Description: ------------ This seems like some kind of an engine regression from 7.3. Staging system running 7.4.2 breaks, live system 7.3.13 works. Code https://github.com/opencredit/badgeos/blob/1.4.11/includes/cmb/init.php#L380 Relevant code below: ``` /** * $field $field array (4) * * ⇄name => string (18) "Upload Badge Image" * * ⇄⧉desc => string (903) "<p>To set an image use the <strong>Achievement Image</strong> metabox to the... * * ⇄id => string (39) "_badgeos_upload_badge_image_achievement" * * ⇄type => string (9) "text_only" */ ... self::$field =& $field; isset( $field['name'] ); // false. How?? ``` Behavior changed when I loaded the same screen on another FPM pool that was running Xdebug - everything passed error free. Behavior also changes if I replace reference with regular assignment, like self::$field = $field - this particular problem goes away, but other (probably unrelated) pieces in the chain now cough. Your thoughts? ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=79193&edit=1