| --TEST-- | |
| Bug #39445 (Calling debug_backtrace() in the __toString() function produces a crash) | |
| --FILE-- | |
| class test { | |
| public function __toString() { | |
| debug_backtrace(); | |
| return 'lowercase'; | |
| } | |
| } | |
| $test = new test(); | |
| echo strtoupper($test); | |
| --EXPECT-- | |
| LOWERCASE | |