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  • Tips for creating closed polygon figures using imageopenpolygon()

    Tips for creating closed polygon figures using imageopenpolygon()

    The imageopenpolygon() function is a very powerful graphical function that allows us to draw closed polygonal figures by specifying a set of coordinates. Polygons can be used in various application scenarios, such as graphics editing, image processing, etc. This article will introduce how to use the imageopenpolygon() function to create enclosed polygons and share some practical tips to make it easier for you to use this function.
    imageopenpolygon
  • How to set color when using imageopenpolygon()
  • imagecreatetruecolor() + imageopenpolygon(): Create an image from scratch
  • How to use imagefilledpolygon() instead of imageopenpolygon() to implement fill polygon

    How to use imagefilledpolygon() instead of imageopenpolygon() function to implement fill polygons and solve the problem of drawing hollow polygons?

    When drawing graphs using PHP's GD library, developers sometimes need to draw polygons on images. Traditionally, the imageopenpolygon() function can draw a hollow polygon outline. But sometimes we want to use imagefilledpolygon() to achieve more flexible drawing effects, especially when we need to deal with color fills and outline styles. This article will introduce how to use imagefilledpolygon() instead of imageopenpolygon() and solve the problem of drawing hollow polygons.
    imageopenpolygon
  • Draw polygon borders in conjunction with imageline()

    How to draw polygon borders using imageopenpolygon() in conjunction with imageline() function?

    When working with images in PHP, we often need to draw various shapes. For drawing polygons, imageopenpolygon() and imageline() are two very practical functions. This article will explain in detail how to use them together to draw polygon borders and give a complete example.
    imageopenpolygon
  • How to avoid the error of "undefined function" in imageopenpolygon()

    How to solve the problem of "Undefined Function" error when using imageopenpolygon() function in PHP?

    The imageopenpolygon() function is a graphical processing function used to draw polygons, which is usually used for image generation and processing. However, some developers may experience "Undefined Function" errors when using this function. This problem usually indicates that some necessary extensions are missing in the PHP environment, which causes the function to be unrecognized or executed.
    imageopenpolygon
  • Dynamically generate coordinate array to draw polygons with arbitrary edges

    How to dynamically generate coordinate arrays and draw polygons of any number of edges using PHP's imageopenpolygon function?

    In the field of image processing, drawing graphics using PHP's GD library is a common skill. Among them, the imageopenpolygon function (the correct function name should be imagepolygon) can be used to draw polygons of any number of edges. This article will introduce in detail how to dynamically generate coordinate arrays and use them to draw regular N-sides.
    imageopenpolygon
  • Write a context debugger tool: Get all options for streams

    Write a context debugger tool: Get all options for streams

    The stream_context_get_options function in PHP can be used to get all options in the stream context, usually used to debug or check the settings when streaming operations are being done. This function returns an associative array showing all configuration options for the specified stream context. Understanding these options is very helpful when debugging complex streaming operations such as file processing, HTTP requests, etc.
    stream_context_get_options
  • Will curl_upkeep() automatically reconnect? The truth is revealed

    Will curl_upkeep() automatically reconnect? The truth is revealed

    curl_upkeep() is a common PHP function that is commonly used to handle connection maintenance and reconnection mechanisms with external URLs. It is especially important for developers to understand its behavior, especially when you are facing a network outage or server unavailability.
    curl_upkeep
  • How to dynamically adjust image width according to imagefontwidth()

    How to dynamically adjust image width according to imagefontwidth()

    When generating images using PHP, it is often necessary to dynamically adjust the width of the image according to the length of the text content to ensure that the text is fully displayed and the layout is beautiful. The imagefontwidth() function is an important tool for implementing this function. This article will explain in detail how to use the imagefontwidth() function to dynamically calculate text width to create an image of the right width.
    imagefontwidth
  • Use attr_get to determine column length in data paging logic

    Use attr_get to determine column length in data paging logic

    Data paging is a very common and important feature when using PHP to manipulate MySQL databases. Pagination can effectively reduce the performance pressure caused by loading large amounts of data at one time and improve user experience. During the paging process, especially for querying large data volumes, prepared statements are often used to ensure security and performance.
    mysqli_stmt::attr_get
  • Use mb_eregi_replace to replace the line break as <br>

    Use mb_eregi_replace to replace the line break as <br>

    The mb_eregi_replace function is a very practical tool when dealing with multibyte strings in PHP. It can be used to replace regular expressions on strings, and supports multi-byte encoding while ignoring upper and lower case. This article will introduce how to use the mb_eregi_replace function to replace newline characters in text (including \r\n, \r and \n) with newline tags in HTML to correctly display the newline effect on a web page.
    mb_eregi_replace
  • session_register_shutdown() How to affect the security of session writes

    session_register_shutdown() How to affect the security of session writes

    In PHP's session management mechanism, session_register_shutdown() is a relatively rarely used function, but it plays a key role in handling the security of writes of session data. Understanding the function of this function will help us gain a deep understanding of how PHP ensures the integrity and consistency of session data.
    session_register_shutdown
  • How to reproduce PHP's bindec() function in Python

    How to reproduce PHP's bindec() function in Python

    The bindec() function is used to convert binary strings into decimal numbers and is a very practical tool when processing binary data. For example:
    bindec
  • How to convert boolean array into decimal permission code with bindec()

    How to convert boolean array into decimal permission code with bindec()

    In web development, we often need to set a set of permissions for users. To simplify the storage and transmission of permissions, the permission state can be compressed into an integer. PHP's bindec function can help us convert a binary string into a decimal integer, which is suitable for encoding and decoding of permission codes.
    bindec
  • Polygon drawing combines GD library to generate verification code images

    How to draw polygons and generate verification code images using the imageopenpolygon function in conjunction with the GD library?

    The GD library provides powerful image processing capabilities to draw a variety of graphics, including polygons. If you want to generate a verification code with a random polygon pattern to improve the anti-crackability of the verification code, the imageopenpolygon function will be very useful.
    imageopenpolygon
  • What is the range of alpha value? (0 to 127)

    What is the range of alpha value? (0 to 127)

    In PHP, the imagecolorallocatealpha() function is a function used to assign colors on an image, which allows setting the transparency of the image. The value of transparency is controlled by the alpha parameter, where the value range of alpha does have certain limitations. Understanding this limitation is very important for the correct use of transparency.
    imagecolorallocatealpha
  • Use socket_accept() to receive data uploads from IoT devices

    Use socket_accept() to receive data uploads from IoT devices

    In Internet of Things (IoT) projects, the server usually needs to receive data uploaded by the device in real time. These devices may use a TCP connection to send sensor data, status information, etc. to the server. Although PHP is not the preferred language for network programming in the traditional sense, it can also be competent for this task through its built-in socket extension. This article will introduce how to use the socket_accept() function to receive data from IoT devices and perform basic processing.
    socket_accept
  • Why does imageantialias() have no effect on PNG images?

    Why does imageantialias() have no effect on PNG images?

    When using PHP's GD image processing library, the imageantialias() function is often used to smooth image edges, especially the drawing of lines, text, and graphics. However, many developers will find that imageantialias() does not produce any obvious effects when processing images in PNG format. Why does this happen? This article will take you to understand the reasons behind it.
    imageantialias
  • How to create dynamic layer overlay effect using imageopenpolygon()

    How to use imageopenpolygon() to achieve visual effects of dynamic overlay of multiple layers?

    imageopenpolygon() is a function in PHP's GD library, which is used to draw polygons with the specified color. The vertices of this polygon can be passed through the coordinate array. The key to multi-layer image overlay is how to draw the graphics of multiple layers onto a picture in different ways.
    imageopenpolygon