Specific usage of PHP function getimagesize_PHP tutorial

Definition

Get the length and width of the image.

Syntax:

array getimagesize(string filename, array [imageinfo]);

Return value:

Array

Function type:

Graphics processing

Content description:

PHP function getimagesize can be used to get the height and width of gif, jpeg and png images on www. You can use this function without installing gd library. The returned array has four elements. The first element of the returned array (index value 0) is the height of the image, in pixels.

The second element (index 1) is the width of the image. The third element (index value 2) is the file format of the image, with a value of 1 for gif format, 2 for jpeg/jpg format, and 3 for png format. The fourth element (index value 3) is the height and width string of the image, height=xxx width=yyy.

The omitted parameter imageinfo is used to obtain some image-related information, such as the app13 tag of iptc (http://www.xe.net/iptc), which can be added to the image. You can use iptcparse( ) to parse.

Code example of PHP function getimagesize:

<ol class="dp-xml">
<li class="alt"><span><span class="tag"><</span><span> ?php  </span></span></li><li><span>function myimg($imgfile) {  </span></li><li class="alt"><span>$</span><span class="attribute">size</span><span> = </span><span class="attribute-value">getimagesize</span><span>($imgfile);  </span></li><li><span>echo "</span><span class="tag"><</span><span class="tag-name">img</span><span> </span><span class="attribute">src</span><span>="$imgfile" $size[3]</span><span class="tag">></span><span>";  </span></span></li>
<li class="alt"><span>}  </span></li>
<li><span>myimg("img/img1.gif");  </span></li>
<li class="alt"><span>myimg("img/img2.png");  </span></li>
<li>
<span class="tag">?></span><span> </span>
</li>
</ol>