Bug #78795 [NEW]: Preg_replace does not always replace

From: markem at sim1 dot us Operating system: Windows 10 PHP version: 7.3.11 Package: Regexps related Bug Type: Bug Bug description:Preg_replace does not always replace Description: ------------ --- From manual page: https://php.net/function.preg-replace --- I was working on correcting a function by dawidgarus at gmail dot com. Got it working (yeah!). But then decided to write my own and expand upon it. That was when I ran into this problem: If you use preg_replace, the "replace" string can not use the $x or ${x} within another variable (like an array). This generates an error. Test script: --------------- function bc() { $argv = func_get_args(); $cmd = $argv[0]; $cmd = preg_replace( "/\$(\d+)/", $argv[$1], $cmd ); return( $cmd ); } $a = bc( "sqrt($1*$1+$2*$2)", 3, 5 ); Expected result: ---------------- $a should equal "sqrt(3*3+5*5)" Actual result: -------------- Notice: Undefined variable: i in C:\Users\Mark\My Programs\PHP\lib\bcd.php on line ### -- Edit bug report at https://bugs.php.net/bug.php?id=78795&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78795&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78795&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78795&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78795&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78795&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78795&r=support Expected behavior: https://bugs.php.net/fix.php?id=78795&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78795&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78795&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78795&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78795&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78795&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78795&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78795&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78795&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78795&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78795&r=mysqlcfg