function drawing($arr = array()) {
    	set_time_limit(0);
    	$image = imagecreate(count($arr[0]), count($arr));
    	imagecolorallocate($image, 255, 255, 255);
    	$color = imagecolorallocate($image, 0, 0, 0);
    	foreach ($arr as $i =＞ $arr_line) {
    		foreach ($arr_line as $j =＞ $arr_pixel) {
    			if( $arr_pixel == 1 ) {
    				imagesetpixel($image, $i, $j, $color);				
    			}
    		}
    	}
    	header("Content-type: image/png");
    	imagepng($image);
    }
    
    $size = 300;
    $arr = array();
    for ($i = 0; $i ＜ $size; $i++) {
    	$arr[$i] = array();
    	for ($j = 0; $j ＜ $size; $j++) {
    		if( $i == $j || $i + $j == $size || $i == 0 || $j == 0 || $i == $size - 1 || $j == $size - 1 ) {
    			$arr[$i][$j] = 1;
    		} else {			
    			$arr[$i][$j] = 0;
    		}
    	}
    }
    
    drawing($arr);
    ```


php 生成 图片 png imagecreate imagecolorallocate imagepng 数组 imagesetpixel