The Imagick::getImageSignature() function is an inbuilt function in PHP which is used to generate an SHA-256 message digest for an image.
Syntax:
string Imagick::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 Imagick::getImageSignature() function in PHP:
Program 1:
Original Image:
<?php   // PHP program to illustrate getImageSignature function $image = new Imagick(   // Using getImageSignature function $pixels = $image->getImageSignature();   print($pixels); ?> |
Output:
f64054f5bcb4cfb82c6126eff6d3d4e6be7d0e72d5620033442cecb4b9feabbd
Program 2:
Original Image:
<?php   $string = "Computer Science portal for Geeks!";   // Creating new image of above String // and add color $im = new Imagick(); $draw = new ImagickDraw();   // Fill the color in image $draw->setFillColor(new ImagickPixel('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 ImagickPixel('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/imagick.getimagesignature.php
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