in reply to Meaning of 'use constant USAGEMSG = > ...'
USAGEMSG is the name of the constant being created:
use constant PI => 3.14;
<<USAGE indicates the presence of a "here-doc". All the lines that follow are treated as a string literal. The string is ended by the keyword, alone on a line (no spaces or anything in front or after).
$Greeting = 'Hello'; $World = 'Earth'; print(<<EOI, <<"End of Input", <<'EOI'); Foo! Bar! EOI $Greeting End of Input $World EOI print(<<"==== End of Template ===="); <html> ... some long piece of hardcoded HTML ... </html> ==== End of Template ==== # Prints: # ======= # Foo! # Bar! # Hello # $World # <html> # ... some long piece of hardcoded HTML ... # </html>
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