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run code in 150+ php & hhvm versions
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<?php $a = array(10, 20); foreach($a as $k=>&$v) { unset($a[$k+1]); var_dump($a); } echo count($a);
Output for 5.2.2 - 7.1.0
array(1) { [0]=> &int(10) } 1
Output for 5.0.0 - 5.2.1
array(1) { [0]=> &int(10) } array(1) { [0]=> &int(10) } 1
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '&', expecting T_VARIABLE or '$' in /in/UBtat on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '&', expecting T_VARIABLE or '$' in /in/UBtat on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_VARIABLE' or `'$'' in /in/UBtat on line 3
Process exited with code 255.