Asked  7 Months ago    Answers:  5   Viewed   31 times

If I pass PHP variables with . in their names via $_GET PHP auto-replaces them with _ characters. For example:

echo "url is ".$_SERVER['REQUEST_URI']."<p>";
echo "x.y is ".$_GET['x.y'].".<p>";
echo "x_y is ".$_GET['x_y'].".<p>";

... outputs the following:

url is /SpShipTool/php/testGetUrl.php?x.y=a.b
x.y is .
x_y is a.b.

... my question is this: is there any way I can get this to stop? Cannot for the life of me figure out what I've done to deserve this

PHP version I'm running with is 5.2.4-2ubuntu5.3.



Here's's explanation of why it does it:

Dots in incoming variable names

Typically, PHP does not alter the names of variables when they are passed into a script. However, it should be noted that the dot (period, full stop) is not a valid character in a PHP variable name. For the reason, look at it:

$varname.ext;  /* invalid variable name */

Now, what the parser sees is a variable named $varname, followed by the string concatenation operator, followed by the barestring (i.e. unquoted string which doesn't match any known key or reserved words) 'ext'. Obviously, this doesn't have the intended result.

For this reason, it is important to note that PHP will automatically replace any dots in incoming variable names with underscores.

That's from

Also, according to this comment these other characters are converted to underscores:

The full list of field-name characters that PHP converts to _ (underscore) is the following (not just dot):

  • chr(32) ( ) (space)
  • chr(46) (.) (dot)
  • chr(91) ([) (open square bracket)
  • chr(128) - chr(159) (various)

So it looks like you're stuck with it, so you'll have to convert the underscores back to dots in your script using dawnerd's suggestion (I'd just use str_replace though.)

Wednesday, March 31, 2021
answered 7 Months ago
$names = array("Mike", "Kyle", "Johnny", "Will", "Vasques");
for($td=0; $td<=9; $td++) {
  echo "<tr>";
  if ($td == 0) {
    foreach ($names as $name) {
      echo "<td>$name</td>";
  echo "<td></td>";
  echo "</tr>";
Wednesday, March 31, 2021
answered 7 Months ago

You need to specify a matching group using brackets in order to extract content.

preg_match("//([^/]+)$/", "5020203010101/FIS/CASH FUND/SBG091241212", $matches);

echo $matches[1];
Wednesday, March 31, 2021
answered 7 Months ago

I would not recommend using regular expressions for a task like this.
A simple function to check a string for properly written brackets is quickly written:

* @param $str input string
* @returns boolean true if all brackets are properly opened and closed, false otherwise
function checkBraces($str)
    $strlen = strlen($str); // cache string length for performance
    $openbraces = 0;

    for ($i = 0; $i < $strlen; $i++)
        $c = $str[$i];
        if ($c == '<') // count opening bracket
        if ($c == '>') // count closing bracket

        if ($openbraces < 0) // check for unopened closing brackets
            return false;

    return $openbraces == 0; // check for unclosed open brackets

Using this code as a basis, it shouldn't be too hard to implement a check to verify whether or not the tag name of opening and closing brackets also matches - but I'll leave that to you :-)

Wednesday, March 31, 2021
answered 7 Months ago


// Set the value explicitly as a string
$objPHPExcel->getActiveSheet()->setCellValueExplicit('A1', '0029', PHPExcel_Cell_DataType::TYPE_STRING);


// Set the value as a number formatted with leading zeroes
$objPHPExcel->getActiveSheet()->setCellValue('A3', 29);

Note that in the first case I'm calling the setCellValueExplicit() method, not the setCellValue() method. In your code, passing PHPExcel_Cell_DataType::TYPE_STRING to setCellValue() has no meaning, and the argument is simply ignored.

Sunday, September 19, 2021
answered 1 Month ago
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