php getimagesize

getimagesize是读取图片相关信息，返回一个具有四个单元的数组。索引 0 包含图像宽度的像素值，索引 1 包含图像高度的像素值。索引 2 是图像类型的标

<?php
$size = getimagesize($filename);
$fp = fopen($filename, "rb");
if ($size && $fp) {
    header("Content-type: {$size[mime]}");
    fpassthru($fp);
    exit;
} else {
    // error
}
?>

#2 getimagesize() example

<?php
list($width, $height, $type, $attr) = getimagesize("img/flag.jpg");
echo "<img src="img/flag.jpg" $attr alt="getimagesize() example" />";
?>

Example #3 getimagesize (URL)

<?php
$size = getimagesize("http://www.example.com/gifs/logo.gif");
$size = getimagesize("http://www.example.com/gifs/lo%20go.gif");
?>

Example #4 getimagesize() returning IPTC

<?php
$size = getimagesize("testimg.jpg", $info);
if (isset($info["APP13"])) {
    $iptc = iptcparse($info["APP13"]);
    var_dump($iptc);
}
?>

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