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php检测上传图片的长度和宽度

Jun 08, 2016 pm 05:27 PM
height nbsp quot width

<script>ec(2);</script>

/*
array getimagesize ( string $filename [, array &$imageinfo ] )

getimagesize()函数将确定任何给定的图像大小的文件,并返回随着文件类型和高度/宽度的文本字符串是在一个正常的HTML IMG标签和相应的HTTP内容类型所使用的尺寸。
The getimagesize() function will determine the size of any given image file and return the dimensions along with the file type and a height/width text string to be used inside a normal HTML I www.111cn.net MG tag and the correspondant HTTP content type

和getimagesize()也可以返回一些imageinfo参数的更多信息。

注意:请注意,少年警讯和JP2是有不同位深度组件的能力。在这种情况下,为“比特”的价值是最高的位深度的困难。此外,JP2上的JPEG文件可能包含多个2000 codestreams。在这种情况下,和getimagesize()返回第一个码流的价值是在文件的根接触。

注:有关资料检索图标从最高比特率图标。
*/

list($width, $height) = getimagesize($image);
$new_dimensions = resize_dimensions(300,400,$width,$height);

// Calculates restricted dimensions with a maximum of $goal_width by $goal_height
function resize_dimensions($goal_width,$goal_height,$width,$height) {
    $return = array('width' => $width, 'height' => $height);
   
    // If the ratio > goal ratio and the width > goal width resize down to goal width
    if ($width/$height > $goal_width/$goal_height && $width > $goal_width) {
        $return['width'] = $goal_width;
        $return['height'] = $goal_width/$width * $height;
    }
    // Otherwise, if the height > goal, resize down to goal height
    else if ($height > $goal_height) {
        $return['width'] = $goal_height/$height * $width;
        $return['height'] = $goal_height;
    }
   
    return $return;
}

/*
上面的函数我们就是利用

php 有个图片GD库getimagesize()函数。
有个函数是获取图片的基本信息。
getimagesize()
$img=getimagesize('图片源');
宽度为=$img[0];
高度为=$img[1];
格式为=$img[2];

如果你要简单的话可以更简单如

*/
$picpath = 'ww.111cn.net.gif';
$array = getimagesize($picpath);
print_r( $array );

echo '图片宽度为'.$array[0];
echo '图片高度为'.$array[1];
echo '图片格式为'.$array[2];

方法四
  //renumber
  $my_image = array_values(getimagesize('test.jpg'));
  //use list on new array
  list($width, $height, $type, $attr) = $my_image;

  //view new array
  print_r($my_image);

  //spit out content
  echo 'Attribute: '.$attr.'
';
  echo 'Width: '.$width.'
';

//这里面就会有图片的宽度与高度了

//再一个利用getimagesize显示缩略图的代码
function show_thumbnail($file)
{
    $max = 200 // Max. thumbnail width and height

    $size = getimagesize($file);

    if ( $size[0]     {
        $ret = 'php检测上传图片的长度和宽度';
    }
    else
    {
        $k = ( $size[0] >= $size[1] ) ? $size[0] / $max : $size[1] / $max;
        $ret = '';
        $ret .= 'View full-size image
';
    }

    return $ret;
}

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