<?php$a = new StdClass();$b = $a;var_dump(is_ref($a, $b));function is_ref(&$a, &$b){ // create a unique different value $differentValue = ($a === true) ? false : true; // We need a copy of $a, to keep safe. Note that if $a is a "referenced" value, $copy will be too. $copy = $a; // Change $a and check if $b changed too, finally restore $a using $copy. $a = $differentValue; $same = $a === $b; $a = $copy; return $same;}<?php$a = new StdClass();$b = $a;var_dump(is_ref($a, $b));function is_ref(&$a, &$b){ // create a unique different value $differentValue = ($a === true) ? false : true; // We need a copy of $a, to keep safe. Note that if $a is a "referenced" value, $copy will be too. $copy = $a; // Change $a and check if $b changed too, finally restore $a using $copy. $a = $differentValue; $same = $a === $b; $a = $copy; return $same;}
Output for 8.0.13
Parse error: syntax error, unexpected variable "$a" in /in/i9ZTU on line 1
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.33
Parse error: syntax error, unexpected '$a' (T_VARIABLE) in /in/i9ZTU on line 1
Process exited with code 255.
<?php$a = new StdClass();$b = $a;var_dump(is_ref($a, $b));function is_ref(&$a, &$b){ // create a unique different value $differentValue = ($a === true) ? false : true; // We need a copy of $a, to keep safe. Note that if $a is a "referenced" value, $copy will be too. $copy = $a; // Change $a and check if $b changed too, finally restore $a using $copy. $a = $differentValue; $same = $a === $b; $a = $copy; return $same;}<?php$a = new StdClass();$b = $a;var_dump(is_ref($a, $b));function is_ref(&$a, &$b){ // create a unique different value $differentValue = ($a === true) ? false : true; // We need a copy of $a, to keep safe. Note that if $a is a "referenced" value, $copy will be too. $copy = $a; // Change $a and check if $b changed too, finally restore $a using $copy. $a = $differentValue; $same = $a === $b; $a = $copy; return $same;}<?php