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<?php var_dump(TRUE,FALSE,NULL); // they have data types and what has data types? variables and constants but keywords are all text function true(){ return 'The truth ...'; } function false(){ return 'Do not be false...'; } function null(){ return 't\'is nothing at all...'; } echo true(); echo false(); echo null(); // if TRUE, FALSE and NULL are keywords then these functions will not execute.
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false) NULL The truth ...Do not be false...t'is nothing at all...

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