Description:
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Many times I read 'this is a language construct and not a function', but there is no list of all the language constructs on php.net. Sometimes I need to use language constructs dynamically and I am sure, more people would like to see a complete list of the language constructs on php.net. For example, I have a timer function, which executes one function and after a while, with negative result, executes another. I had to make a pf_exit($exit_code) function as it is also a language construct http://nl2.php.net/manual/en/function.exit.php

Test script:
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/* Example functions for language constructs */
function pf_exit($exit_code) {
   exit($exit_code);
}

function pf_echo($to_echo) {
   echo $to_echo;
}