3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function foo(array &$x = array()){} $x = array(); foo($x[]); foo($x[]); foo($x[]); foo($x[]); var_dump($x);
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be of the type array, null given, called in /in/ik1HB on line 6 and defined in /in/ik1HB:2 Stack trace: #0 /in/ik1HB(6): foo(NULL) #1 {main} thrown in /in/ik1HB on line 2
Process exited with code 255.
Output for hhvm-3.10.0 - 3.12.0
Catchable fatal error: Argument 1 passed to foo() must be an instance of array, null given in /in/ik1HB on line 2
Process exited with code 255.
Output for 5.4.0 - 5.6.28
Catchable fatal error: Argument 1 passed to foo() must be of the type array, null given, called in /in/ik1HB on line 6 and defined in /in/ik1HB on line 2
Process exited with code 255.
Output for 5.2.3 - 5.3.29
Catchable fatal error: Argument 1 passed to foo() must be an array, null given, called in /in/ik1HB on line 6 and defined in /in/ik1HB on line 2
Process exited with code 255.
Output for 5.2.0 - 5.2.2
<br /> <b>Catchable fatal error</b>: Argument 1 passed to foo() must be an array, null given, called in /in/ik1HB on line 6 and defined in <b>/in/ik1HB</b> on line <b>2</b><br />
Process exited with code 255.
Output for 5.1.0 - 5.1.6
<br /> <b>Fatal error</b>: Argument 1 passed to foo() must not be null, called in /in/ik1HB on line 6 and defined in <b>/in/ik1HB</b> on line <b>2</b><br />
Process exited with code 255.
Output for 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in <b>/in/ik1HB</b> on line <b>2</b><br />
Process exited with code 255.
Output for 4.4.2 - 4.4.9
<br /> <b>Parse error</b>: syntax error, unexpected T_ARRAY, expecting ')' in <b>/in/ik1HB</b> on line <b>2</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
<br /> <b>Parse error</b>: parse error, unexpected T_ARRAY, expecting ')' in <b>/in/ik1HB</b> on line <b>2</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error, expecting `')'' in <b>/in/ik1HB</b> on line <b>2</b><br />
Process exited with code 255.