Php remove everything after symbol

Php remove after character

$s = 'Posted On April 6th By Some Dude';
echo strstr($s, 'By', true); // Posted On April 6th

$fullpath = 'folderName/file.ext';
$folder = substr($fullpath, 0, strpos($fullpath, '/'));
echo $folder;
// Output => folderName

$variable = substr($variable, 0, strpos($variable, "By"));

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