The Gmagick::getimagesignature() function is an inbuilt function in PHP which is used to generate an SHA-256 message digest for an image.
Syntax:
string Gmagick::getimagesignature( void )
Parameters: This function does not accept any parameter.
Return Value: This function returns a string of SHA-256 hash of the file.
Below programs illustrate the Gmagick::getimagesignature() function in PHP:
Original Image 1:
Program 1:
<?php // PHP program to illustrate getimagesignature() function $image = new Gmagick( // Using getimagesignature() function $pixels = $image->getimagesignature(); print($pixels); ?> |
Output:
f64054f5bcb4cfb82c6126eff6d3d4e6be7d0e72d5620033442cecb4b9feabbd
Original Image 2:
Program 2:
<?php $string = "Computer Science portal for Geeks!"; // Creating new image of above String // and add color $im = new Gmagick(); $draw = new GmagickDraw(); // Fill the color in image $draw->setFillColor(new GmagickPixel('green')); // Set the text font size $draw->setFontSize(50); $metrix = $im->queryFontMetrics($draw, $string); $draw->annotation(0, 40, $string); $im->newImage($metrix['textWidth'], $metrix['textHeight'], new GmagickPixel('white')); // Draw the image $im->drawImage($draw); $im->setImageFormat('jpeg'); // Using getimagesignature function $pixels = $im->getimagesignature(); print($pixels); ?> |
Output:
ed79035e13153385c344d19586e98941dd336165a3ca486200097c0bd2f4188c
Reference: http://php.net/manual/en/gmagick.getimagesignature.php
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