Backend Development
PHP Tutorial
PHP operation Imagick library printing numerical matrix_PHP tutorial
PHP operation Imagick library printing numerical matrix_PHP tutorial
PHP can achieve many picture effects by operating the Imagick library, such as printing an 8*10 digital matrix on a picture. The method to achieve the above effect is as follows:
PHP operates Imagick library code
<ol class="dp-c">
<li class="alt"><span><span class="comment"><font color="#008200">//格子的尺寸 </font></span><span> </span></span></li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span> = 18; </span><span class="comment"><font color="#008200">//字体大小 </font></span><span> </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span> = </span><span class="string"><font color="#0000ff">"#000"</font></span><span>; </span><span class="comment"><font color="#008200">//字体颜色 </font></span><span> </span>
</li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$grid_width</font></span><span> = 36; </span><span class="comment"><font color="#008200">//格子的宽度 </font></span><span> </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$grid_height</font></span><span> = 24; </span><span class="comment"><font color="#008200">//格子的高度 </font></span><span> </span>
</li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span> = 15; </span><span class="comment"><font color="#008200">//左上角的数字的起始横坐标 </font></span><span> </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$grid_origin_y</font></span><span> = 98; </span><span class="comment"><font color="#008200">//左上角的数字的起始纵坐标 </font></span><span> </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> #原图 </span></li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> Imagick(</span><span class="string"><font color="#0000ff">'background.jpg'</font></span><span>); </span>
</li>
<li class="alt"><span> </span></li>
<li class=""><span> #写入密保卡数据 </span></li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>; </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_y</font></span><span>; </span>
</li>
<li class="alt">
<span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$pData</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k</font></span><span> => </span><span class="vars"><font color="#dd0000">$v</font></span><span>){ </span>
</li>
<li class="">
<span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$v</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k_grid_data</font></span><span> => </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>){ </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_width</font></span><span>; </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> ImagickDraw(); </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFillColor(</span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span>); </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFontSize(</span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span>); </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->annotation(</span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span>, </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span>, </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>); </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->drawImage(</span><span class="vars"><font color="#dd0000">$draw</font></span><span>); </span>
</li>
<li class="alt"><span> } </span></li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>; </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_height</font></span><span>; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->writeImage(</span><span class="vars"><font color="#dd0000">$ks_ImageSrcPath</font></span><span>. </span><span class="vars"><font color="#dd0000">$pSN</font></span><span>. </span><span class="string"><font color="#0000ff">'.jpg'</font></span><span>); </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> #释放资源 </span></li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$image</font></span><span>->destroy(); </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->destroy(); </span>
</li>
<li class=""><span> </span></li>
</ol>The consequence of this is that it must be instantiated every time it is looped An ImagickDraw and executes the drawImage method, which consumes a lot of CPU resources.
can be optimized from the following two points:
1. It is not necessary to execute the new operation every time, one is enough;
2. It is not necessary to execute the drawImage method every time, Once is enough. In other words, the annotation method seems to have the meaning of "additional", so you don't have to worry about the later overwriting the previous one;
The optimized code for PHP operation Imagick library is as follows:
<ol class="dp-c">
<li class="alt"><span><span class="vars"><font color="#dd0000">$draw</font></span><span> = </span><span class="keyword"><strong><font color="#006699">new</font></strong></span><span> ImagickDraw(); </span></span></li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFillColor(</span><span class="vars"><font color="#dd0000">$grid_font_color</font></span><span>); </span>
</li>
<li class="alt">
<span></span><span class="vars"><font color="#dd0000">$draw</font></span><span>->setFontSize(</span><span class="vars"><font color="#dd0000">$grid_font_size</font></span><span>); </span>
</li>
<li class="">
<span></span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$pData</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k</font></span><span> => </span><span class="vars"><font color="#dd0000">$v</font></span><span>){ </span>
</li>
<li class="alt">
<span> </span><span class="keyword"><strong><font color="#006699">foreach</font></strong></span><span> (</span><span class="vars"><font color="#dd0000">$v</font></span><span> </span><span class="keyword"><strong><font color="#006699">as</font></strong></span><span> </span><span class="vars"><font color="#dd0000">$k_grid_data</font></span><span> => </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>){ </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_width</font></span><span>; </span>
</li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$draw</font></span><span>->annotation(</span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span>, </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span>, </span><span class="vars"><font color="#dd0000">$v_grid_data</font></span><span>); </span>
</li>
<li class=""><span> } </span></li>
<li class="alt">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_x</font></span><span> = </span><span class="vars"><font color="#dd0000">$grid_origin_x</font></span><span>; </span>
</li>
<li class="">
<span> </span><span class="vars"><font color="#dd0000">$tmp_grid_origin_y</font></span><span> += </span><span class="vars"><font color="#dd0000">$grid_height</font></span><span>; </span>
</li>
<li class="alt"><span>} </span></li>
<li class="">
<span></span><span class="vars"><font color="#dd0000">$image</font></span><span>->drawImage(</span><span class="vars"><font color="#dd0000">$draw</font></span><span>); </span>
</li>
</ol>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
Explain the match expression (PHP 8 ) and how it differs from switch.
Apr 06, 2025 am 12:03 AM
In PHP8, match expressions are a new control structure that returns different results based on the value of the expression. 1) It is similar to a switch statement, but returns a value instead of an execution statement block. 2) The match expression is strictly compared (===), which improves security. 3) It avoids possible break omissions in switch statements and enhances the simplicity and readability of the code.
What is Cross-Site Request Forgery (CSRF) and how do you implement CSRF protection in PHP?
Apr 07, 2025 am 12:02 AM
In PHP, you can effectively prevent CSRF attacks by using unpredictable tokens. Specific methods include: 1. Generate and embed CSRF tokens in the form; 2. Verify the validity of the token when processing the request.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
