Image resizing not working (using base64) - php

Question

The following code is supposed to output a resized image in a string. Unfortunately it only outputs MQ== so where is my mistake? Help is really appreciated :)
<?php
// The file
$filename = 'tick.png';
// Set a maximum height and width
$width = 200;
$height = 200;
// Get new dimensions
list($width_orig, $height_orig) = getimagesize($filename);
$ratio_orig = $width_orig/$height_orig;
if ($width/$height > $ratio_orig) {
$width = $height*$ratio_orig;
} else {
$height = $width/$ratio_orig;
}
// Resample
$image_p = imagecreatetruecolor($width, $height);
$image = imagecreatefrompng($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
$newImage = imagepng($image_p, null, 100); // got in has to be from 0 to 9
echo base64_encode(file_get_contents($newImage)); // this still does not work°
?>

Answer 1

Compression level can't be 100. Only from 0 to 9.
imagepng($image_p, null, from 0 to 9);
Base64 encode you can do with:
ob_start();
imagepng($image_p, null, 9); // got in has to be from 0 to 9
$stream = ob_get_clean();
echo base64_encode($stream);

Answer 2

This is how i do it:
$Temp_Dump = $_FILES["file"]["tmp_name"];
// Get new sizes
list($width, $height) = getimagesize($Temp_Dump);
$newwidth = 90;
$newheight = 90;
// Load
$Temp_thumb = imagecreatetruecolor($newwidth, $newheight);
//$source = imagecreatefromjpeg($Temp_Dump);
if($extension == "jpg" OR $extension=='jpeg'){
$source = ImageCreateFromJpeg($Temp_Dump);
}elseif ($extension == "gif"){
$source = ImageCreateFromGIF($Temp_Dump);
}elseif ($extension == 'png'){
$source = imageCreateFromPNG($Temp_Dump);
}
// Resize
imagecopyresized($Temp_thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);