Trim对我的要求不够好吗？

Question

$x = "''xx''";

echo $x, "
";
echo trim($x, "'");

In this program i want to trim only one single quote from start and one from end. Trim removes all the single quotes from starting and end.

I wish it would remove just one quote.

Answer 1

$x = preg_replace("/^'?(.*?)'?$/", '$1', $x);

Or if you have an aversion to using regular expressions:

if (substr($x, 0, 1) === "'") {
    $x = substr($x, 1);
}
if (substr($x, -1) === "'") {
    $x = substr($x, 0, -1);
}