PHP | Imagick getImageSignature() Function

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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( 
"https://media.zambiatek.com/wp-content/uploads/zambiatek-15.png"); 
  
// 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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