Added PHP API for registering tick functions. Ticks is a per-instruction
callback in Zend that allows us to implement cooperative multitasking
within PHP. Example:
In extension code:
php_add_tick_function(my_tick_func);
void my_tick_func(int count) {
php_printf("[tick %d]", count);
}
In PHP code:
<?php
declare(ticks = 1) {
print "there should be two ticks here.\n";
}
?>