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PHP Imagick getIteratorIndex () function

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Syntax:
int Imagick::getIteratorIndex (void)
Parameters:This function takes no parameters.Return value:This function returns an integer value containing the index of the image on the stack.Exceptions:This function throws an ImagickException on error.The following programs illustrate the Imagick::getIteratorIndex() functionin PHP:Program 1:  
// Create a new imagick object $imagick = new Imagick ( https://media.engineerforengineer.org/wp-content/uploads/engineerforengineer-13.png );  
// Get index $index = $imagick -> getIteratorIndex(); echo $index ; ?>
Output:
0 // Which means the first image.
Program 2: < ? php  
// Create a new imagick object $imagick = new Imagick ( https://media.engineerforengineer.org/wp-content/uploads/engineerforengineer-13.png );  
// Add two more images to the same imagick object $imagick -> addImage ( new Imagick ( https://media.engineerforengineer.org/wp-content/uploads/engineerforengineer-13.png )); $imagick -> addImage ( new Imagick ( https://media. engineerforengineer.org/wp-content/uploads/engineerforengineer-13.png ));  
// Get index $index = $imagick -> getIteratorIndex(); echo $index ; ?>
Output:
2 // Which means the third image.
Link: https://www.php.net/manual/en/imagick.getiteratorindex.php
SO 1 data error