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    <p>Well .. i have to admit.. this was interesting to me on a personal level !!! anyway ... here is the code... you can test it here : <a href="http://www.eyerollweb.com/str2digits/" rel="nofollow">http://www.eyerollweb.com/str2digits/</a></p> <p>and here is the code itself:</p> <pre><code>&lt;?php //The Test string $str = "two hundred thousand six hundred and two"; $numbers = array( 'zero' =&gt; 0, 'one' =&gt; 1, 'two' =&gt; 2, 'three' =&gt; 3, 'four' =&gt; 4, 'five' =&gt; 5, 'six' =&gt; 6, 'seven' =&gt; 7, 'eight' =&gt; 8, 'nine' =&gt; 9, 'ten' =&gt; 10, 'eleven' =&gt; 11, 'twelve' =&gt; 12, 'thirteen' =&gt; 13, 'fourteen' =&gt; 14, 'fifteen' =&gt; 15, 'sixteen' =&gt; 16, 'seventeen' =&gt; 17, 'eighteen' =&gt; 18, 'nineteen' =&gt; 19, 'twenty' =&gt; 20, 'thirty' =&gt; 30, 'forty' =&gt; 40, 'fourty' =&gt; 40, // common misspelling 'fifty' =&gt; 50, 'sixty' =&gt; 60, 'seventy' =&gt; 70, 'eighty' =&gt; 80, 'ninety' =&gt; 90, 'hundred' =&gt; 100, 'thousand' =&gt; 1000, 'million' =&gt; 1000000, 'billion' =&gt; 1000000000); //first we remove all unwanted characters... and keep the text $str = preg_replace("/[^a-zA-Z]+/", " ", $str); //now we explode them word by word... and loop through them $words = explode(" ", $str); //i devide each thousands in groups then add them at the end //For example 2,640,234 "two million six hundred and fourty thousand two hundred and thirty four" //is defined into 2,000,000 + 640,000 + 234 //the $total will be the variable were we will add up to $total = 1; //flag to force the next operation to be an addition $force_addition = false; //hold the last digit we added/multiplied $last_digit = null; //the final_sum will be the array that will hold every portion "2000000,640000,234" which we will sum at the end to get the result $final_sum = array(); foreach ($words as $word) { //if its not an and or a valid digit we skip this turn if (!isset($numbers[$word]) &amp;&amp; $word != "and") { continue; } //all small letter to ease the comparaison $word = strtolower($word); //if it's an and .. and this is the first digit in the group we set the total = 0 //and force the next operation to be an addition if ($word == "and") { if ($last_digit === null) { $total = 0; } $force_addition = true; } else { //if its a digit and the force addition flag is on we sum if ($force_addition) { $total += $numbers[$word]; $force_addition = false; } else { //if the last digit is bigger than the current digit we sum else we multiply //example twenty one =&gt; 20+1, twenty hundred 20 * 100 if ($last_digit !== null &amp;&amp; $last_digit &gt; $numbers[$word]) { $total += $numbers[$word]; } else { $total *= $numbers[$word]; } } $last_digit = $numbers[$word]; //finally we distinguish a group by the word thousand, million, billion &gt;= 1000 ! //we add the current total to the $final_sum array clear it and clear all other flags... if ($numbers[$word] &gt;= 1000) { $final_sum[] = $total; $last_digit = null; $force_addition = false; $total = 1; } } } // there is your final answer ! $final_sum[] = $total; print "Final Answer: " . array_sum($final_sum) . "\n"; ?&gt; </code></pre>
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    1. COI can even edit the code for it to detect multiple numbers "set of numbers" in the same string ... like for example: "this is sentence where i can say one and then after a while say another two hundred to get some awesome results" and the returned value would be 1, 200 :)
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