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Variable functions: In some cases you might want a user to choose which function to apply on some values. You can use a variable to call the function. e.g.,

<?php 


function sum($v1, $v2) { return ($v1 + $v2); } 


function minus($v1, $v2) { return ($v1 - $v2); } 


          


$function = "sum"; 


print $function(10,5).'<br>'; 


$function = "minus"; 


print $function(10,5).'<br>'; 


?>

It's essential that you use the same number of parameters.   Kevin Solway (173)

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Slashes and quotes: Make sure you thoroughly test your PHP code when it displays text that may contain quotes and slashes (such as "John's/Jonathan's"). This should be tested both with "magic_quotes" turned on, and also with it turned off. Very few sites get this right, and you will often see displayed text, such as product names, which contain any number of slashes that shouldn't be there.   Kevin Solway (173)

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