The Imagick::previousImage() function is an inbuilt function in PHP which is used to move to the previous image within the Imagick instance. An Imagick instance may consist of a list of images within it and Imagick previousImage() moves the pointer/cursor to the previous image in the image list within an Imagick instance.
Syntax:
bool Imagick::previousImage( void )
Parameters: This function doesn’t accepts any parameter.
Return Value: This function returns TRUE on success.
Exceptions: This function throws ImagickException on error.
Below given programs illustrate the Imagick::previousImage() function in PHP:
Program 1:
<?php   // Create a new imagick object $imagick = new Imagick(   // Add a image to the imagick object. $imagick->addImage(new Imagick(   // Get the index $index1 = $imagick->getIteratorIndex(); echo 'Before: ' . $index1 . '<br>';   // Move the cursor to first image $imagick->previousImage(); $imagick->previousImage();   // Get the index $index2 = $imagick->getIteratorIndex(); echo 'After: ' . $index2 . '<br>'; ?> |
Output:
Before: 1 After: 0
Program 2:
<?php   // Create a new imagick object $imagick = new Imagick(   // Add a image to the imagick object. $imagick->addImage(new Imagick(   // Move the cursor to first image $imagick->previousImage(); $imagick->previousImage();   // Display the image header("Content-Type: image/png"); echo $imagick->getImageBlob(); ?> |
Output:
Reference: https://www.php.net/manual/en/imagick.previousimage.php
