(PECL cairo >= 0.1.0)
CairoImageSurface::getWidth — Retrieves the width of the CairoImageSurface
此函数没有参数。
Returns the width of the CairoImageSurface object
Example #1 CairoImageSurface::getWidth() example
<?php
// creates a new image surface
$surface = new CairoImageSurface(CairoFormat::ARGB32, 80, 50);
//gets the width
var_dump($surface->getWidth());
?>
以上例程的输出类似于：
int(80)