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<?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); // ^ ^
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.1, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Scalar demonstration: bool(true) bool(true) Array demonstration: Array ( ) Array ( )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Scalar demonstration: bool(true) bool(true) Array demonstration: Array ( ) Array ( )
Output for 5.2.1 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 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 - 5.1.6, 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.
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