Bug #76343 [NEW]: array_walk myth

From: young dot inbox at gmail dot com Operating system: Ubuntu PHP version: 7.2.5 Package: Arrays related Bug Type: Bug Bug description:array_walk myth Description: ------------ After updating from PHP 7.0.* to 7.2.5 next code start failing with PHP Warning: ExcelSheet::writeRow(): Failed to write cell in row 0, column 0 with error 'ok' in /home/ddc/young/htdocs/2.php on line 18 It use https://github.com/iliaal/php_excel module and you may think that the problem with this module, but this not true. If i will comment array_walk, which in this case NOT changing data - it will work fine With array_walk it gives error but data array is the same with and without array_walk call so array_walk call changing not only the data but something invisible in addition, but should not Test script: --------------- <?php $data = array ( 0 => 'test me hard' ); $xlBook = new \ExcelBook(null, null, true); $xlBook->setLocale('UTF-8'); $xlSheet1 = $xlBook->addSheet('Sheet1'); var_dump($data); array_walk($data, function(&$field) { $field = (string)$field; }); var_dump($data); $xlSheet1->writeRow(0, $data); Expected result: ---------------- Same result with and without array_walk Actual result: -------------- Error with array_walk and success without -- Edit bug report at https://bugs.php.net/bug.php?id=76343&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76343&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76343&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76343&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76343&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76343&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76343&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76343&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76343&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76343&r=support Expected behavior: https://bugs.php.net/fix.php?id=76343&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76343&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76343&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76343&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76343&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76343&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76343&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76343&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76343&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76343&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76343&r=mysqlcfg