PHP | ImagickPixelIterator __construct() function

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The ImagickPixelIterator::__construct() function is an inbuilt function in PHP which is used create a instance of ImagickPixelIterator object. This object is used to iterate through the pixels.

Syntax:

bool ImagickPixelIterator::__construct( Imagick $wand )

Parameters:This function accepts a single parameter $wand which holds the image.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

Below given programs illustrate the ImagickPixelIterator::__construct() function in PHP:
Program 1:

<?php 
// Create a new imagick object 
$imagick = new Imagick(); 
   
// Create a image on imagick object 
$imagick->newImage(800, 250, 'black'); 
  
// Create a new imagickPixelIterator object 
$imageIterator = new ImagickPixelIterator($imagick); 
   
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
   
    foreach ($pixels as $column => $pixel) { 
        // Set the color of each pixel to blue 
        $pixel->setColor('blue'); 
    } 
   
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
  
// Show the output 
$imagick->setImageFormat('png'); 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

Program 2:

<?php 
// Create a new imagick object 
$imagick = new Imagick( 
    'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
// Create a new imagickPixelIterator object 
$imageIterator = new ImagickPixelIterator($imagick); 
  
$i = 0; 
  
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
  
    foreach ($pixels as $column => $pixel) { 
        $i++; 
    } 
  
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
  
echo 'Total number of pixels: ' . $i; 
?> 

Output:

Total number of pixels: 122728

Reference: https://www.php.net/manual/en/imagickpixeliterator.construct.php

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