3v4l.org

run code in 300+ PHP versions simultaneously
<?php function brokenTrace($arg1, $arg2) { backtraceWrapper(); unset($arg1); backtraceWrapper(); unset($arg2); backtraceWrapper(); } function backtraceWrapper() { $bt = debug_backtrace(); $args = $bt[1]['args']; for ($i = 0; $i < count($args); $i++) { var_dump($args[$i]); } } brokenTrace("A", "B");
Output for 7.1.10 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(1) "A" string(1) "B" NULL string(1) "B" NULL NULL
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.7
string(1) "A" string(1) "B" Notice: Undefined offset: 0 in /in/CSZs7 on line 17 NULL
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
string(1) "A" string(1) "B" string(1) "A" string(1) "B" string(1) "A" string(1) "B"
preferences:
208.37 ms | 402 KiB | 258 Q