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To allow the use of PHP s build-in eval() function, it is necessary to remove any harmful expressions before passing them to the function To achieve this, the array $f1 contains 22 function names (out of the hundreds supported by PHP) that are considered safe Using the $f2 array, which contains a matching set of tokens, any of the 22 functions found in the argument $expr are converted to a corresponding token This means that any remaining alphabetical characters may form other function names and therefore are stripped out The preceding is achieved by first converting the string $expr to lowercase using the function strtolower() and then employing str_replace() to replace all occurrences of the allowed function names with their tokens Next preg_replace() is called to strip out anything remaining that is not required, using the regular expression /[^\d\+\*\/\-\()! ]/ Okay, I know it looks like I just dropped the keyboard on the floor but this is actually a powerful expression which I ll now break up for you The outer / characters denote the start and end of a regular expression The square brackets, [], state that a match should be made against any single character enclosed within them The ^ symbol, when immediately following a [ symbol, forces negation, so that the expression will match anything that is not one of the characters following Next comes a sequence of characters, which are all escaped by prefacing them with a \ symbol, because otherwise they would be interpreted as special regular expression operators: \d Any digit (0 9) \+ An addition symbol \* A multiplication symbol \/ A division symbol \- A subtraction symbol \ A decimal point symbol So, if any symbol is not one of these escaped symbols, it will be considered a match and the second argument to preg_replace(), '', will replace it with nothing in other words, the symbol will be removed Finally, a few other symbols are also allowed through These are the left and right brackets, the comma, the exclamation mark, and a space You might wonder why the exclamation mark is allowed within a mathematical expression Well, the answer isn t that the exclamation mark is needed for use in expressions, because it isn t Instead, it s there because it forms part of each of the 22 tokens in the array $f2 Once the mathematical functions have been converted to tokens, the ! symbols remain there so that the tokens can be converted back again after stripping the remaining unwanted characters out, which is done using another call to the str_replace() function I chose the exclamation mark at random and could equally have used any one of many other symbols After all this processing, the resulting sanitized string is passed to the eval() function, the result of which is returned to the calling statement If you wish to see what the sanitized expression looks like, you can uncomment the line shown in the source code.



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scolding (Folksy Also with have See the note at get a big send-off See also give someone a tongue-lashing) I really got a tongue-lashing when I got home Ted

get back (at someone)

thing when other people are talking and ignoring you (Often in the negative) It was such an exciting conversation that I could hardly get a word in edgewise Mary talks so fast that nobody can get a word in edgeways

get back (at someone ) and have back at someone to repay one for a bad deed; to get even (with someone ) (Have back at someone is informal or folksy Compare this with have at someone or something at get at someone or something ) Tom called me a





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or faster The boss is coming You d better get busy I ve got to get busy and clean this house up Come on, everybody Let s get busy and get this job done

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