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<?php
// 设置内容类型为图像
header('Content-Type: image/png');
// 创建画布
$width = 800;
$height = 100;
$image = imagecreatetruecolor($width, $height);
// 定义颜色
$backgroundColor = imagecolorallocate($image, 0, 0, 0); // 黑色背景
$textColor = imagecolorallocate($image, 255, 255, 255); // 白色文字
// 填充背景
imagefilledrectangle($image, 0, 0, $width, $height, $backgroundColor);
// 要显示的弹幕文字
$danmuTexts = [
"欢迎来到m66.net！",
"PHP制作弹幕图层演示",
"让文字飞一会儿~"
];
// 使用内置字体编号（1-5）
$font = 5;
// 获取字体的宽度与高度
$charWidth = imagefontwidth($font);
$charHeight = imagefontheight($font);
// 初始Y位置
$y = 10;
// 循环绘制每条弹幕
foreach ($danmuTexts as $index => $text) {
// 计算文字总宽度
$textWidth = strlen($text) * $charWidth;
// 设置X位置为图像右侧外边界，用于模拟从右向左滚动
$x = $width - ($index * 50); // 模拟不同起始偏移
// Y位置随行数递增
$textY = $y + $index * ($charHeight + 5);
// 绘制文字
imagestring($image, $font, $x, $textY, $text, $textColor);
}
// 输出图像
imagepng($image);
imagedestroy($image);
?>
Use imagecreatetruecolor() to create a blank canvas with a specified width and height.
Set the color:
Use imagecolorallocate() to assign color values to the background and text respectively.
Fill background color:
Use imagefilledrectangle() to fill the entire layer into black to simulate common barrage backgrounds.
Set text content and font:
Define the few paragraphs of text to be displayed and select the PHP built-in font (number 1-5). If you are using imagettftext(), you can also support custom TTF font files.
Calculate text width:
imagefontwidth() returns the pixel width of each character in the current font. Combined with strlen() , you can calculate the required width of the entire text.
Draw text:
imagestring() is used to draw text and place it in the appropriate position on the canvas. We set different X offsets to simulate the effect of the barrage entering from the right.
Output the image and destroy the resource:
Use imagepng() to output PNG images, and then use imagedestroy() to release resources.
