Imagick::getIteratorIndex

(PECL imagick 2, PECL imagick 3)

Imagick::getIteratorIndex — Gets the index of the current active image

说明

public Imagick::getIteratorIndex(): int

Returns the index of the current active image within the Imagick object. 此方法在Imagick基于ImageMagick 6.2.9以上版本编译时可用。

参数

此函数没有参数。

返回值

Returns an integer containing the index of the image in the stack.

错误／异常

错误时抛出 ImagickException。

范例

示例 #1 Using Imagick::getIteratorIndex():

Create images, set and get the iterator index


<?php
$im = new Imagick();
$im->newImage(100, 100, new ImagickPixel("red"));
$im->newImage(100, 100, new ImagickPixel("green"));
$im->newImage(100, 100, new ImagickPixel("blue"));

$im->setIteratorIndex(1);
echo $im->getIteratorIndex();
?>

参见

Imagick::setIteratorIndex() - Set the iterator position
Imagick::getImageIndex() - Gets the index of the current active image
Imagick::setImageIndex() - Set the iterator position

add a note

User Contributed Notes 2 notes

down

Michael O'Connell ¶

6 years ago


This will also retrieve which page number of a multipage document (i.e. PDF, PS) file the Imagick instance is currently on.  By default for a PDF it seems to be set to the last page.

down

holdoffhunger at gmail dot com ¶

10 years ago


The getIteratorIndex function of the ImageMagick function works on any type of image, but it is built for measuring the number of frames in an animated .gif file.  For non-animated image files, like regular .bmp or .jpg files, this function will always return the number '0', meaning that there is only one frame.  Counting starts from zero with this function, so a .gif file with five different frames will return a value of '4' on this.  Highly repetitive, but psychedelic animated GIF's are often anywhere between 10 and 30 frames, but a .gif file that is nothing more than video footage converted to a datafile may have hundreds of frames.

According to Wikipedia (in the article for "Graphics Interchange Format"), an animated GIf image is a uses the GIF standard "which allows various images (frames) in the file to be painted with time delays."  This function won't get you the amount of time that delays between each frame, but it will give you the number of unique frames in a .gif file.  This will tell you how complicated or simple the animation may be.

Is the 'getIteratorIndex' function not working for you?  Try the 'getImageIndex' function, which produces the same exact result.

Some sample code :

<?php

            // Author: holdoffhunger@gmail.com
    
        // Imagick Type
        // ---------------------------------------------

    $imagick_type = new Imagick();
    
        // Open File
        // ---------------------------------------------
        
    $file_to_grab = "image_workshop_directory/test.gif";
    
    $file_handle_for_viewing_image_file = fopen($file_to_grab, 'a+');
    
        // Grab File
        // ---------------------------------------------

    $imagick_type->readImageFile($file_handle_for_viewing_image_file);
    
        // Get Image Type Value
        // ---------------------------------------------
        
    $image_iterator_index = $imagick_type->getIteratorIndex();
    
        // Print Image Type Value
        // ---------------------------------------------
        
    print("Number of Unique Frames in the .GIF File: $image_iterator_index");

?>

add a note

官方地址：https://www.php.net/manual/en/imagick.getiteratorindex.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 php $_SERVER中的SERVER_NAME 和HTTP_HOST的区别 adodb连接mysql多个数据库的问题 PHPstorm 里面Terminal 不能使用 esc键吗退出编辑模式吗

略微加速

PHP官方手册 - 互联网笔记

Imagick::getIteratorIndex

说明

参数

返回值

错误／异常

范例

参见

User Contributed Notes 2 notes