在PHP中，可以使用反斜杠（\）来转义特殊字符。以下是一些常见的转义字符的示例：
$str = "This is a \"quoted\" string.";
echo $str; // 输出：This is a "quoted" string.
$str = 'This is a \'quoted\' string.';
echo $str; // 输出：This is a 'quoted' string.
$str = "This is a \\ backslash.";
echo $str; // 输出：This is a \ backslash.
$str = "This is a line of text.\nThis is a new line.";
echo $str; // 输出：
// This is a line of text.
// This is a new line.
$str = "This is a tabbed\ttext.";
echo $str; // 输出：This is a tabbed text.
需要注意的是，在使用某些特殊字符时，还需要考虑字符串的引号使用，避免引号的冲突。
