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run code in 150+ php & hhvm versions
Bugs & Features
<?php // r() simply returns a reference to a given variable. function &r(&$v){return $v;} // Here, we have a scalar $a on which settype() fails to operate if // parentheses are involved. print "Scalar demonstration:\n"; $a = 1; // First with parentheses, then without. // v v settype( ( r($a) ) , "boolean"); var_dump($a); settype( r($a) , "boolean"); var_dump($a); // ^ ^ // Here is a similar situation where array_pop() fails to operate upon a // reference to an array if parentheses are involved. print "\nArray demonstration:\n"; $b = array("c"); // First with parentheses, then without. // v v array_pop( ( r($b) ) ); print_r($b); array_pop( r($b) ); print_r($b); // ^ ^
based on RPGZO
Output for 4.3.0 - 5.0.5, 5.1.1, 5.6.8 - 7.1.0
Scalar demonstration: bool(true) bool(true) Array demonstration: Array ( ) Array ( )
Output for 5.2.1 - 5.5.35
Scalar demonstration: Strict Standards: Only variables should be passed by reference in /in/9QqBr on line 13 int(1) bool(true) Array demonstration: Strict Standards: Only variables should be passed by reference in /in/9QqBr on line 25 Array ( [0] => c ) Array ( )
Output for 5.1.2 - 5.2.0
Scalar demonstration: Strict Standards: Only variables should be passed by reference in /in/9QqBr on line 13 int(1) Strict Standards: Only variables should be passed by reference in /in/9QqBr on line 14 int(1) Array demonstration: Strict Standards: Only variables should be passed by reference in /in/9QqBr on line 25 Array ( [0] => c ) Strict Standards: Only variables should be passed by reference in /in/9QqBr on line 26 Array ( [0] => c )
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/9QqBr on line 27
Process exited with code 255.