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PHP | imagecreatefromstring() Function

  • Last Updated : 14 Feb, 2020

The imagecreatefromstring() function is an inbuilt function in PHP which is used to create a new image from string file or URL. This image can be further worked upon in the program. This function is usually used when you want to edit your images after loading them from a string.

Syntax:

resource imagecreatefromstring( string $filename )

Parameters:This function accepts a single parameter $filename which holds the name of image.

Return Value: This function returns an image resource identifier on success, FALSE on errors.

Below given programs illustrate the imagecreatefromstring() function in PHP:



Program 1 (Viewing the image from string):




<?php
  
// Image data in the form of string
$data = 'iVBORw0KGgoAAAANSUhEUgAAAHgAAAAUAQMAAAB'
      . '8nGuwAAAABlBMVEX///8AAP94wDzzAAAACXBIWX'
      . 'MAAA7EAAAOxAGVKw4bAAAAgUlEQVQYlWNgIBHYM'
      . 'TDwMDB8gDEYkkEU4wwog4HhAIx/AMqX4+c5/rDh'
      . '4x4w4wHDAWPJ3h7DxhnPwAwDhuOJG87zsD/mOQB'
      . 'mMDAcrt9/nv1hM88BMOMBw+EEA94GQxAfxDBgSD'
      . 'acceYMUP8BMMOAwU6evyf9YcOHA2DGA1K9QykAA'
      . 'NIrNwD/nKH3AAAAAElFTkSuQmCC';
   
// Decode the data
$data = base64_decode($data);
   
// Create an image from data
$im = imagecreatefromstring($data);
   
// Output the image
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>

Output:

Program 2 (Working on loaded string image):




<?php
  
// Image data in the form of string
$data = 'iVBORw0KGgoAAAANSUhEUgAAAHgAAAAUAQMAAAB'
      . '8nGuwAAAABlBMVEX///8AAP94wDzzAAAACXBIWX'
      . 'MAAA7EAAAOxAGVKw4bAAAAgUlEQVQYlWNgIBHYM'
      . 'TDwMDB8gDEYkkEU4wwog4HhAIx/AMqX4+c5/rDh'
      . '4x4w4wHDAWPJ3h7DxhnPwAwDhuOJG87zsD/mOQB'
      . 'mMDAcrt9/nv1hM88BMOMBw+EEA94GQxAfxDBgSD'
      . 'acceYMUP8BMMOAwU6evyf9YcOHA2DGA1K9QykAA'
      . 'NIrNwD/nKH3AAAAAElFTkSuQmCC';
   
// Decode the data
$data = base64_decode($data);
   
// Create an image from data
$im = imagecreatefromstring($data);
   
// Negate the image
imagefilter($im, IMG_FILTER_NEGATE);
   
// Output the image
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>

Output:

Reference: https://www.php.net/manual/en/function.imagecreatefromstring.php




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