Bug #75781 [NEW]: substr_count incorrect result

From: gajowy at agzeta dot pl Operating system: Windows 10 64bit PHP version: 7.1.13 Package: Strings related Bug Type: Bug Bug description:substr_count incorrect result Description: ------------ For "big" string the substr_count function returns incorrect result. Memory limit in PHP set to 30GB. Seems it works incorrect for strings>4GB. Test script: --------------- <?php $size=9*1024*1024*1024; // 9GB $buf=str_repeat(chr(0),$size); for( $i=0; $i<$size; $i++ ) if( $i%3==0 ) $buf{$i}=chr(255); $cnt=substr_count($buf,chr(255)); var_dump($cnt); ?> Expected result: ---------------- int(3221225472) Actual result: -------------- int(-1073741824) -- Edit bug report at https://bugs.php.net/bug.php?id=75781&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75781&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75781&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75781&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75781&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75781&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75781&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75781&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75781&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75781&r=support Expected behavior: https://bugs.php.net/fix.php?id=75781&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75781&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75781&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75781&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75781&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75781&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75781&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75781&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75781&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75781&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75781&r=mysqlcfg