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The function getimagesize obtains the length and width of the image and other information

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Release： 2016-07-25 09:01:50

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The function getimagesize returns an array with four cells.
Index 0 contains the pixel value of the image width,
Index 1 contains the pixel value of the image height.
Index 2 is the tag of the image type: 1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF(intel byte order), 8 = TIFF(motorola byte order) , 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM.
These tags correspond to the IMAGETYPE constant added in PHP 4.3.0. Index 3 is a text string with the content "height="yyy" width="xxx"" and can be used directly in the IMG tag.
PHP official website manual

$images_array = array("http://static.zend.com/img/logo.gif");
foreach($images_array as $image){
list($width, $height, $type, $attr) = getimagesize($image);
$new_height = (int)(192 / $width * $height);
echo '
';
}

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函数getimagesize获得图片的长宽等信息

source：php.cn

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