Explain to you the specific method of adding watermark to images in PHP

Home

Backend Development

PHP Tutorial

Explain to you the specific method of adding watermark to images in PHP_PHP Tutorial

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jul 15, 2016 pm 01:29 PM

phpuploadspecificaddpictureusmethodwatermarkofnetwebsiteexplainmeet

When we are building a website, we will all encounter the need to add watermarks to the pictures uploaded on the website. It will definitely be very troublesome and impractical to add watermarks one by one manually. So, today we will accept the specific method of adding watermark to pictures in PHP and simplify the steps.

The specific code to add watermark to the picture is as follows:

<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span>   </span></span></li>
<li class=""><span>/******************************************************************************   </span></li>
<li class="alt"><span> </span></li>
<li class=""><span>参数说明:   </span></li>
<li class="alt"><span>$max_file_size  : 上传文件大小限制, 单位BYTE   </span></li>
<li class=""><span>$destination_folder : 上传文件路径   </span></li>
<li class="alt"><span>$watermark   : 是否附加水印(1为加水印,其他为不加水印);   </span></li>
<li class=""><span> </span></li>
<li class="alt"><span>使用说明:   </span></li>
<li class="">
<span>1. 将PHP.INI文件里面的"</span><span class="attribute"><font color="#ff0000">extension</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">php_gd2</font></span><span>.dll"一行前面的;号去掉,因为我们要用到GD库;   </span>
</li>
<li class="alt">
<span>2. 将</span><span class="attribute"><font color="#ff0000">extension_dir</font></span><span> =改为你的php_gd2.dll所在目录;   </span>
</li>
<li class=""><span>******************************************************************************/   </span></li>
<li class="alt"><span> </span></li>
<li class=""><span>//上传文件类型列表   </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">uptypes</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">array</font></span><span>(   </span>
</li>
<li class=""><span>    'image/jpg',   </span></li>
<li class="alt"><span>    'image/jpeg',   </span></li>
<li class=""><span>    'image/png',   </span></li>
<li class="alt"><span>    'image/pjpeg',   </span></li>
<li class=""><span>    'image/gif',   </span></li>
<li class="alt"><span>    'image/bmp',   </span></li>
<li class=""><span>    'image/x-png'   </span></li>
<li class="alt"><span>);   </span></li>
<li class=""><span> </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">max_file_size</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">2000000</font></span><span>;     //上传文件大小限制, 单位BYTE   </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">destination_folder</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"uploadimg/"</font></span><span>; //上传文件路径   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">watermark</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;      //是否附加水印(1为加水印,其他为不加水印);   </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">watertype</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;      //水印类型(1为文字,2为图片)   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">waterposition</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;     //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);   </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">waterstring</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"http://www.xplore.cn/"</font></span><span>;  //水印字符串   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">waterimg</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"xplore.gif"</font></span><span>;    //水印图片   </span>
</li>
<li class="">
<span>$</span><span class="attribute"><font color="#ff0000">imgpreview</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>;      //是否生成预览图(1为生成,其他为不生成);   </span>
</li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">imgpreviewsize</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">1</font></span><span>/2;    //缩略图比例   </span>
</li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>   </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">html</span><span class="tag">></span></span></font></strong><span>   </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">head</span><span class="tag">></span></span></font></strong><span>   </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>ZwelL图片上传程序</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span>   </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">style</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"text/css"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span>   </span>
</li>
<li class="alt"><span></span></li>
</ol>

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

How to calculate the total number of elements in a PHP multidimensional array?May 15, 2025 pm 09:00 PM

Calculating the total number of elements in a PHP multidimensional array can be done using recursive or iterative methods. 1. The recursive method counts by traversing the array and recursively processing nested arrays. 2. The iterative method uses the stack to simulate recursion to avoid depth problems. 3. The array_walk_recursive function can also be implemented, but it requires manual counting.

What are the characteristics of do-while loops in PHP?May 15, 2025 pm 08:57 PM

In PHP, the characteristic of a do-while loop is to ensure that the loop body is executed at least once, and then decide whether to continue the loop based on the conditions. 1) It executes the loop body before conditional checking, suitable for scenarios where operations need to be performed at least once, such as user input verification and menu systems. 2) However, the syntax of the do-while loop can cause confusion among newbies and may add unnecessary performance overhead.

How to hash strings in PHP?May 15, 2025 pm 08:54 PM

Efficient hashing strings in PHP can use the following methods: 1. Use the md5 function for fast hashing, but is not suitable for password storage. 2. Use the sha256 function to improve security. 3. Use the password_hash function to process passwords to provide the highest security and convenience.

How to implement array sliding window in PHP?May 15, 2025 pm 08:51 PM

Implementing an array sliding window in PHP can be done by functions slideWindow and slideWindowAverage. 1. Use the slideWindow function to split an array into a fixed-size subarray. 2. Use the slideWindowAverage function to calculate the average value in each window. 3. For real-time data streams, asynchronous processing and outlier detection can be used using ReactPHP.

How to use the __clone method in PHP?May 15, 2025 pm 08:48 PM

The __clone method in PHP is used to perform custom operations when object cloning. When cloning an object using the clone keyword, if the object has a __clone method, the method will be automatically called, allowing customized processing during the cloning process, such as resetting the reference type attribute to ensure the independence of the cloned object.

How to use goto statements in PHP?May 15, 2025 pm 08:45 PM

In PHP, goto statements are used to unconditionally jump to specific tags in the program. 1) It can simplify the processing of complex nested loops or conditional statements, but 2) Using goto may make the code difficult to understand and maintain, and 3) It is recommended to give priority to the use of structured control statements. Overall, goto should be used with caution and best practices are followed to ensure the readability and maintainability of the code.

How to implement data statistics in PHP?May 15, 2025 pm 08:42 PM

In PHP, data statistics can be achieved by using built-in functions, custom functions, and third-party libraries. 1) Use built-in functions such as array_sum() and count() to perform basic statistics. 2) Write custom functions to calculate complex statistics such as medians. 3) Use the PHP-ML library to perform advanced statistical analysis. Through these methods, data statistics can be performed efficiently.

How to use anonymous functions in PHP?May 15, 2025 pm 08:39 PM

Yes, anonymous functions in PHP refer to functions without names. They can be passed as parameters to other functions and as return values of functions, making the code more flexible and efficient. When using anonymous functions, you need to pay attention to scope and performance issues.

See all articles