PHP 输出到 img 标签

Question

我有这个脚本可以将图像输出到命令行，如果我将它重定向到 file.png，我可以正确地看到图形，但是如果我尝试从浏览器执行相同的操作，我就不能即时查看。

我也试过将脚本分成两部分，但没有用。

1 -> 生成图形 2 -> 从这个调用第一个脚本并将所有脚本保存在一个变量中。

脚本：

<?php

header("Content-Type: image/png");
header("Content-Transfer-Encoding: binary");
ob_flush();

require_once ('/opt/rMON/config.php');

//if(isset($_GET['id'])){
//  $id = trim($_GET['id']);
//} else {
//  die("El id?");
//}
//DEBUG ID
$id=1;

$result = ***MYSQL QUERY***
$ip         = long2ip($result['ip']);
$interface  = $result['interface'];
$counter    = $result['counter'];
$unix_name  = $result['unix_name'];
$community  = $result['community'];
$version    = $result['version'];
$port       = $result['port'];
$rrd_file   = __RRD_ROOT__.$unix_name.".rrd";
$graph_name = $result['name'];
$host_ip    = long2ip($result['ip']);
$iface_name = $result['iface_name'];
$fecha      = date("y-m-d h:i:s");

$start = "3600";
$tiempo = "1 Hora";
create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo);

function create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo){
    $opts = array (
        "--imgformat=PNG",
        "--slope-mode",
        "--title=$graph_name ($host_ip) - $iface_name - $tiempo",
        "--rigid",
        "--base=1000",
        "--height=120",
        "--width=500",
        "--alt-autoscale-max",
        "--lower-limit=0",
        "--font=TITLE:10:",
        "--font=AXIS:8:",
        "--font=LEGEND:8:",
        "--font=UNIT:8:30:",
        "--watermark=$fecha - Radu Radu",
        "--start=-$start",
        "--end=now",
        "DEF:a=$rrd_file:$input:AVERAGE",
        "DEF:b=$rrd_file:$output:AVERAGE",
        "CDEF:cdefa=a,8,*",
        "CDEF:cdefe=b,8,*",
        "AREA:cdefa#00CF00FF:Entrante\t",
        "GPRINT:cdefa:LAST:Actual\:%8.2lf %s",
        "GPRINT:cdefa:AVERAGE:Promedio\:%8.2lf %s",
        "GPRINT:cdefa:MAX:Máximo\:%8.2lf %s",
        "LINE1:cdefe#002A97FF:Saliente\t",
        "GPRINT:cdefe:LAST:Actual\:%8.2lf %s",
        "GPRINT:cdefe:AVERAGE:Promedio\:%8.2lf %s",
        "GPRINT:cdefe:MAX:Máximo\:%8.2lf %s"
    );

    $ret = rrd_graph("-", $opts);
    if(!$ret){
        echo "ERROR en el objeto: $graph_name ".rrd_error()."\n";
    }
}
?>

我尝试输出到 php://output 也没有运气。

正如我在日志中看到的，输出将转到 apache 服务器日志。

"dic 21 10:58:00 xxx.xxx.com httpd[27941]: [305B blob data]"

谢谢！！

Answer 1

你做错了。 rrd_graph 不接受 - for $filename 并且它 returns 一个包含生成图像信息的数组；它不输出或刷新任何图像数据。 - $filename 参数用于 RRDGraph class。为了获得图像数据，您需要打开rrd_graph生成的文件，读取其数据并输出数据，或者使用RRDGraph返回的数组['image']键来获取二进制文件图像数据。

使用rrd_graph函数

function create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo) {
    $opts = array (
        "--imgformat=PNG",
        "--slope-mode",
        "--title=$graph_name ($host_ip) - $iface_name - $tiempo",
        "--rigid",
        "--base=1000",
        "--height=120",
        "--width=500",
        "--alt-autoscale-max",
        "--lower-limit=0",
        "--font=TITLE:10:",
        "--font=AXIS:8:",
        "--font=LEGEND:8:",
        "--font=UNIT:8:30:",
        "--watermark=$fecha - Radu Radu",
        "--start=-$start",
        "--end=now",
        "DEF:a=$rrd_file:$input:AVERAGE",
        "DEF:b=$rrd_file:$output:AVERAGE",
        "CDEF:cdefa=a,8,*",
        "CDEF:cdefe=b,8,*",
        "AREA:cdefa#00CF00FF:Entrante\t",
        "GPRINT:cdefa:LAST:Actual\:%8.2lf %s",
        "GPRINT:cdefa:AVERAGE:Promedio\:%8.2lf %s",
        "GPRINT:cdefa:MAX:Máximo\:%8.2lf %s",
        "LINE1:cdefe#002A97FF:Saliente\t",
        "GPRINT:cdefe:LAST:Actual\:%8.2lf %s",
        "GPRINT:cdefe:AVERAGE:Promedio\:%8.2lf %s",
        "GPRINT:cdefe:MAX:Máximo\:%8.2lf %s"
    );

    $fileName = "rrd.png";
    $ret = rrd_graph($fileName, $opts);

    if(!$ret){
        echo "ERROR en el objeto: $graph_name ".rrd_error()."\n";
    }
    else {
        header("Content-Type: image/png");
        header("Content-Length: " . filesize($fileName));
        $fp = fopen($fileName, 'rb');
        if($fp) {
            fpassthru($fp);
            fclose($fp);
            exit();
        }
    }
}

使用RRDGraphclass

function create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo){
    $opts = array (
        "--imgformat=PNG",
        "--slope-mode",
        "--title=$graph_name ($host_ip) - $iface_name - $tiempo",
        "--rigid",
        "--base=1000",
        "--height=120",
        "--width=500",
        "--alt-autoscale-max",
        "--lower-limit=0",
        "--font=TITLE:10:",
        "--font=AXIS:8:",
        "--font=LEGEND:8:",
        "--font=UNIT:8:30:",
        "--watermark=$fecha - Radu Radu",
        "--start=-$start",
        "--end=now",
        "DEF:a=$rrd_file:$input:AVERAGE",
        "DEF:b=$rrd_file:$output:AVERAGE",
        "CDEF:cdefa=a,8,*",
        "CDEF:cdefe=b,8,*",
        "AREA:cdefa#00CF00FF:Entrante\t",
        "GPRINT:cdefa:LAST:Actual\:%8.2lf %s",
        "GPRINT:cdefa:AVERAGE:Promedio\:%8.2lf %s",
        "GPRINT:cdefa:MAX:Máximo\:%8.2lf %s",
        "LINE1:cdefe#002A97FF:Saliente\t",
        "GPRINT:cdefe:LAST:Actual\:%8.2lf %s",
        "GPRINT:cdefe:AVERAGE:Promedio\:%8.2lf %s",
        "GPRINT:cdefe:MAX:Máximo\:%8.2lf %s"
    );

    $graphObj = new RRDGraph('-');
    $graphObj->setOptions($opts);
    $ret = $graphObj->saveVerbose();

    if(!$ret){
        echo "ERROR en el objeto: $graph_name ".rrd_error()."\n";
    }
    else {
        header("Content-type: image/png");
        echo $res['image'];
        exit();
    }
}

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