<?php $test; // Это выводит все переменные $test = 0;
Standard input is empty
array(7) { ["_GET"]=> array(0) { } ["_POST"]=> array(0) { } ["_COOKIE"]=> array(0) { } ["_FILES"]=> array(0) { } ["argv"]=> array(1) { [0]=> string(8) "prog.php" } ["argc"]=> int(1) ["_SERVER"]=> array(17) { ["LANG"]=> string(11) "en_US.UTF-8" ["WORKSPACE"]=> string(41) "/tmp/0b5c4256-d28a-46e5-be85-284a7a535a92" ["PWD"]=> string(12) "/home/SIjhXz" ["HOME"]=> string(12) "/home/SIjhXz" ["TMPDIR"]=> string(11) "/tmp/yLuKqs" ["TMPDIR_GLOBAL"]=> string(41) "/tmp/0b5c4256-d28a-46e5-be85-284a7a535a92" ["SHLVL"]=> string(1) "0" ["PATH"]=> string(28) "/usr/local/bin:/usr/bin:/bin" ["PHP_SELF"]=> string(8) "prog.php" ["SCRIPT_NAME"]=> string(8) "prog.php" ["SCRIPT_FILENAME"]=> string(8) "prog.php" ["PATH_TRANSLATED"]=> string(8) "prog.php" ["DOCUMENT_ROOT"]=> string(0) "" ["REQUEST_TIME_FLOAT"]=> float(1546278524.1376) ["REQUEST_TIME"]=> int(1546278524) ["argv"]=> array(1) { [0]=> string(8) "prog.php" } ["argc"]=> int(1) } } array(8) { ["_GET"]=> array(0) { } ["_POST"]=> array(0) { } ["_COOKIE"]=> array(0) { } ["_FILES"]=> array(0) { } ["argv"]=> array(1) { [0]=> string(8) "prog.php" } ["argc"]=> int(1) ["_SERVER"]=> array(17) { ["LANG"]=> string(11) "en_US.UTF-8" ["WORKSPACE"]=> string(41) "/tmp/0b5c4256-d28a-46e5-be85-284a7a535a92" ["PWD"]=> string(12) "/home/SIjhXz" ["HOME"]=> string(12) "/home/SIjhXz" ["TMPDIR"]=> string(11) "/tmp/yLuKqs" ["TMPDIR_GLOBAL"]=> string(41) "/tmp/0b5c4256-d28a-46e5-be85-284a7a535a92" ["SHLVL"]=> string(1) "0" ["PATH"]=> string(28) "/usr/local/bin:/usr/bin:/bin" ["PHP_SELF"]=> string(8) "prog.php" ["SCRIPT_NAME"]=> string(8) "prog.php" ["SCRIPT_FILENAME"]=> string(8) "prog.php" ["PATH_TRANSLATED"]=> string(8) "prog.php" ["DOCUMENT_ROOT"]=> string(0) "" ["REQUEST_TIME_FLOAT"]=> float(1546278524.1376) ["REQUEST_TIME"]=> int(1546278524) ["argv"]=> array(1) { [0]=> string(8) "prog.php" } ["argc"]=> int(1) } ["test"]=> int(0) }