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Functions
<?php
											 
											/*
												Functions
												© Charles Chandler
												http://qdl.scs-inc.us/?top=12801
											*/
											 
											error_reporting(E_ALL);
											 
											function Random($minVal, $maxVal, $precision = 3) {
											$powPrec = pow(10, $precision);
											$randomFloat = mt_rand(0, $powPrec) / $powPrec;
											return $min + ($randomFloat * ($maxVal - $minVal));
											}
											 
											function Pt($x, $y, $z) {
											// just a shorthand for building the array
											return array('x' => floatval($x), 'y' => floatval($y), 'z' => floatval($z));
											}
											 
											function Gravity_n($m1_kg, $m2_kg, $dist_m) {
											// Given two masses (in kilograms), and the distance between them
											// (in meters), this returns the gravitational force (in Newtons).
											return (6.67384 * pow(10, -11) * $m1_kg * $m2_kg) / ($dist_m * $dist_m);
											}
											 
											function Electricity_n($num_e_1, $num_e_2, $dist_m) {
											// Given two quantities of elementary charges, and the distance between
											// them (in meters), this returns the electric force (in Newtons).
											$c1 = $num_e_1 * e; // convert elementary charges to coulombs
											$c2 = $num_e_2 * e; // convert elementary charges to coulombs
											return (8.988 * pow(10, 9) * $c1 * $c2) / ($dist_m * $dist_m);
											}
											 
											function ScientificNotation($num, $prec) {
											$minus = ($num < 0) ? '&minus;' : '';
											$num = abs($num);
											$exp = NULL;
											if ($num) {
											$exp = round(log($num, 10));
											if (abs($exp) > 2) {
											$num = $num / pow(10, $exp);
											if ($num < 1) { $num *= 10; $exp -= 1; }
											if ($exp < 0) $exp = '&minus;'.(abs($exp));
											$exp = '&thinsp;&times;&thinsp;10<sup>'.$exp.'</sup>';
											} else $exp = NULL;
											}
											return $minus.round($num, $prec).$exp;
											}
											 
											function lpad($theString, $theLength, $theCharacter = ' ') {
											return str_pad($theString, $theLength, $theCharacter, STR_PAD_LEFT);
											}
											 
											function DirList($directory) {
											$directory = trim($directory, '/');
											$results = array();
											if (file_exists($directory)) {
											$dir = opendir($directory);
											while ($file = readdir($dir)) {
											if (($file != '.') and ($file != '..') and ($file != '.DS_Store') and ($file != '__MACOSX')) {
											$results[] = $file;
											}
											}
											closedir($dir);
											}
											natcasesort($results);
											return $results;
											}
											 
											function VarExport($var) {
											ob_start();
											var_export($var);
											return ob_get_clean();
											}
											 
											function file_put_array($file, $arrayName) {
											global $$arrayName;
											$output = '<?php'."\n\n".'$'.$arrayName.' = '.VarExport($$arrayName).";\n\n?>\n";
											file_put_contents($file, $output);
											}
											 
											function StripOneTailer($theString, $theTailer) {
											$tailerLength = strlen($theTailer);
											if (substr($theString, -$tailerLength, $tailerLength) == $theTailer) {
											$theString = substr($theString, 0, strlen($theString) - $tailerLength);
											}
											return $theString;
											}
											 
											function ErrorHandler($errNum, $errMsg, $fileName, $lineNum, $vars) {
											$errTypes = array (
											E_ERROR              => 'Error',
											E_WARNING            => 'Warning',
											E_PARSE              => 'Parsing Error',
											E_NOTICE             => 'Notice',
											E_CORE_ERROR         => 'Core Error',
											E_CORE_WARNING       => 'Core Warning',
											E_COMPILE_ERROR      => 'Compile Error',
											E_COMPILE_WARNING    => 'Compile Warning',
											E_USER_ERROR         => 'QDL Error',
											E_USER_WARNING       => 'QDL Warning',
											E_USER_NOTICE        => 'QDL Dev Notice',
											E_STRICT             => 'Runtime Notice',
											E_RECOVERABLE_ERROR  => 'Catchable Fatal Error',
											//E_DEPRECATED         => 'Deprecated Feature',
											//E_USER_DEPRECATED    => 'User Deprecated Feature',
											);
											$pieces = explode('/', $fileName);
											echo '
												<table>
												<tr><td>error type: </td><td>'.$errTypes[$errNum].'</td></tr>
												<tr><td>message:    </td><td>'.$errMsg.'</td></tr>
												<tr><td>file name:  </td><td>'.end($pieces).'</td></tr>
												<tr><td>line num:   </td><td>'.$lineNum.'</td></tr>
												</table>
											';
											exit();
											}
											 
											set_error_handler('ErrorHandler');
											 
										?>
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