php - 警告 : preg_replace() [function. preg-replace]:C:\xampp 中的正则表达式为空

Question

我正在尝试将数据输出到图表，但我在 preg_replace 语句上收到此错误。

ImageTTFText($this->img, $which_font['size'], $which_angle, 
                         $which_xpos, $which_ypos, $which_color, $which_font['font'], $which_text);
        }
        // Fixed fonts:
        else {
            // explode the text by its lines, and count them
            $which_text = preg_replace("\r", "", $which_text);
            $str = explode("\n", $which_text);
            $nlines = count($str);
            $spacing = $this->line_spacing * ($nlines - 1);

Answer 1

您的正则表达式是\r，这是无效的；您必须有开始/结束分隔符(例如，/)。尝试将其更改为 /\r/:

$which_text = preg_replace("/\r/", "", $which_text);