PHP reference counting and variable reference_PHP tutorial
php reference counting and variable reference
Each php5.5 variable is stored in a variable container called zval.<?php $a = "Hello world"; $b = &$a; $c = $a; print_r(xdebug_debug_zval('a')); print_r(xdebug_debug_zval('b')); print_r(xdebug_debug_zval('c')); ?>
<?php function foo(&$var) { $var =& $GLOBALS["baz"]; } foo($bar); ?>

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