3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { public $i; _construct(){ $this->i++; } } $f = new foo(); $x = new $f; echo $f instanceof foo; echo $f->i; echo $x instanceof foo; echo $x->i;
Output for 7.1.0 - 7.1.7
Parse error: syntax error, unexpected '_construct' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/FPCPB on line 5
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Parse error: syntax error, unexpected '_construct' (T_STRING), expecting function (T_FUNCTION) in /in/FPCPB on line 5
Process exited with code 255.
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