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<?php $a = 10; $b = 20; $c = 30; $d = 40; $defined_variables = get_defined_vars(); $variables2keep = array("a", "b", "c"); foreach($defined_variables as $variable => $value) if(!in_array($variable, $variables2keep)) unset($$variable); print_r(get_defined_vars());
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => 10 [b] => 20 [c] => 30 [defined_variables] => Array ( [_GET] => Array ( ) [_POST] => Array ( ) [_COOKIE] => Array ( ) [_FILES] => Array ( ) [argv] => Array ( [0] => /in/3tQ45 ) [argc] => 1 [_SERVER] => Array ( [TERM] => xterm [PATH] => /usr/bin:/bin [LANG] => C [SHELL] => /bin/sh [MAIL] => /var/mail/nobody [LOGNAME] => nobody [USER] => nobody [HOME] => /tmp [PHP_SELF] => /in/3tQ45 [SCRIPT_NAME] => /in/3tQ45 [SCRIPT_FILENAME] => /in/3tQ45 [PATH_TRANSLATED] => /in/3tQ45 [DOCUMENT_ROOT] => [REQUEST_TIME_FLOAT] => 1414515000.0001 [REQUEST_TIME] => 1414515000 [argv] => Array ( [0] => /in/3tQ45 ) [argc] => 1 ) [a] => 10 [b] => 20 [c] => 30 [d] => 40 ) [variables2keep] => Array ( [0] => a [1] => b [2] => c ) [value] => 40 [variable] => d )

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