Bug #80051 [NEW]: strip_tags clears string when starting with the lesser then or equal operator.

From: stefan at concera dot com Operating system: Ubuntu 16.04.7 LTS x86_64 PHP version: 7.4.10 Package: Strings related Bug Type: Bug Bug description:strip_tags clears string when starting with the lesser then or equal operator. Description: ------------ When executing the strip_tags function, using a string that starts with the lesser then or equal operator, it will be deleted... I accidentally found this out when stripping tags of an array with values, used for a <select>-element. When I strip the string '<= (Less then or equal)', it will result into an empty string. I also tried to add it to the $allowable_tags parameter, like this strip_tags('<= (Less then or equal)', '<=>'), but this doesn't seem to work either. Test script: --------------- <?php $array = [ '= (Equal)', '!= (Not equal)', '> (Greater then)', '>= (Greater then or equal)', '< (Less then)', '<= (Less then or equal)', ]; foreach( $array as $key => $value ) { echo $key."\t=>\t".strip_tags($value)."\n"; } Expected result: ---------------- 0 => = (Equal) 1 => != (Not equal) 2 => > (Greater then) 3 => >= (Greater then or equal) 4 => < (Less then) 5 => <= (Less then or equal) Actual result: -------------- 0 => = (Equal) 1 => != (Not equal) 2 => > (Greater then) 3 => >= (Greater then or equal) 4 => < (Less then) 5 => -- Edit bug report at https://bugs.php.net/bug.php?id=80051&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80051&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80051&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80051&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80051&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80051&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80051&r=support Expected behavior: https://bugs.php.net/fix.php?id=80051&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80051&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80051&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80051&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80051&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80051&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80051&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80051&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80051&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80051&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80051&r=mysqlcfg