Bug #71695 [NEW]: Global variables are reserved before execution

From: buglloc at yandex dot ru Operating system: Linux 4.4.1-2-ARC PHP version: 7.0.3 Package: Scripting Engine problem Bug Type: Bug Bug description:Global variables are reserved before execution Description: ------------ I have ported some code from PHP 5 to PHP 7 and founds strange behavior - seems global variables are reserved (?) before execution. I wrote simple test code: https://3v4l.org/teWDV Is this expected backward incompatible changes or bug? This peace of code wants to provide "system" global variables w/o override existed (I know that is so ugly...), what i must do? For example, rewrite the function: function provideGlobals() { $GLOBALS += array("foo" => "foo"); } to something like this: function provideGlobals() { foreach(array("foo" => "foo") as $key => $val) { if(!isset($GLOBALS[$key])) { $GLOBALS[$key] = $val; } } } Test script: --------------- <?php function provideGlobals() { printf("Is foo exists: %d\n", array_key_exists("foo", $GLOBALS)); $GLOBALS += array("foo" => "foo"); } provideGlobals(); echo $foo; Expected result: ---------------- Is foo exists: 0 foo Actual result: -------------- Is foo exists: 1 Notice: Undefined variable: foo in /in/teWDV on line 9 -- Edit bug report at https://bugs.php.net/bug.php?id=71695&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71695&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71695&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71695&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71695&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71695&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71695&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71695&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71695&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71695&r=support Expected behavior: https://bugs.php.net/fix.php?id=71695&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71695&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71695&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71695&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71695&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71695&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71695&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71695&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71695&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71695&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71695&r=mysqlcfg