running something via C<system>).
X<$?>
+Inside of a C<END> block, the value of C<${^GLOBAL_PHASE}> will be
+C<"END">.
+
C<UNITCHECK>, C<CHECK> and C<INIT> code blocks are useful to catch the
transition between the compilation phase and the execution phase of
the main program.
C<(?{ })> construct in a regex, calls to C<do FILE>, C<require FILE>,
and code after the C<-e> switch on the command line.
+C<BEGIN> and C<UNITCHECK> blocks are not directly related to the phase of
+the interpreter. They can be created and executed during any phase.
+
C<CHECK> code blocks are run just after the B<initial> Perl compile phase ends
and before the run time begins, in LIFO order. C<CHECK> code blocks are used
in the Perl compiler suite to save the compiled state of the program.
+Inside of a C<CHECK> block, the value of C<${^GLOBAL_PHASE}> will be
+C<"CHECK">.
+
C<INIT> blocks are run just before the Perl runtime begins execution, in
"first in, first out" (FIFO) order.
+Inside of an C<INIT> block, the value of C<${^GLOBAL_PHASE}> will be C<"INIT">.
+
The C<CHECK> and C<INIT> blocks in code compiled by C<require>, string C<do>,
or string C<eval> will not be executed if they occur after the end of the
main compilation phase; that can be a problem in mod_perl and other persistent