PHP調整圖像

Question

基本上是一個圖像是畫布HTML5元素上創建並使用下面的代碼

<?php 
$upload_dir = "uploads/"; 
$img = $_POST['hidden_data']; 
$imageID = $_POST['imageID']; 
$img = str_replace('data:image/png;base64,', '', $img); 
$img = str_replace(' ', '+', $img); 
$data = base64_decode($img); 
$file = $upload_dir . "gillette_" . $imageID . ".png"; 
$success = file_put_contents($file, $data); 
print $success ? $file : 'Unable to save the file.'; 
?> 

我想保存縮略圖版本100x100像素，但在服務器上保存爲圖像更喜歡做直接從流中。任何幫助將不勝感激

下面的代碼調整和保存圖像沒有工作，試圖用imagecreatefromstring

<?php 
############ Configuration ############## 
$thumb_square_size  = 100; //Thumbnails will be cropped to 200x200 pixels 
$max_image_size = 520; //Maximum image size (height and width) 
$thumb_prefix = "small_"; //Normal thumb Prefix 
$destination_folder = 'uploads/'; //upload directory ends with/(slash) 
$jpeg_quality   = 90; //jpeg quality 
########################################## 


$upload_dir = "uploads/"; 
$img = $_POST['hidden_data']; 
$imageID = $_POST['imageID']; 
$img = str_replace('data:image/png;base64,', '', $img); 
$img = str_replace(' ', '+', $img); 
$data = base64_decode($img); 
$file = $upload_dir . "gillette_" . $imageID . ".png"; 
$success = file_put_contents($file, $data); 
print $success ? $file : 'Unable to save the file.'; 

$im = imagecreatefromstring($data); 

    if($im){ 


     $new_file_name = $imageID . ".png"; 
     $thumb_save_folder = $destination_folder . $thumb_prefix . $new_file_name; 

      //call crop_image_square() function to create square thumbnails 
      if(!crop_image_square($im, $thumb_save_folder, "png", $thumb_square_size, 520, 382, $jpeg_quality)) 
      { 
       die('Error Creating thumbnail'); 
      } 

     imagedestroy($im); //freeup memory 
    } 



##### This function corps image to create exact square, no matter what its original size! ###### 
function crop_image_square($source, $destination, $image_type, $square_size, $image_width, $image_height, $quality){ 
    if($image_width <= 0 || $image_height <= 0){return false;} //return false if nothing to resize 

    if($image_width > $image_height) 
    { 
     $y_offset = 0; 
     $x_offset = ($image_width - $image_height)/2; 
     $s_size  = $image_width - ($x_offset * 2); 
    }else{ 
     $x_offset = 0; 
     $y_offset = ($image_height - $image_width)/2; 
     $s_size = $image_height - ($y_offset * 2); 
    } 
    $new_canvas = imagecreatetruecolor($square_size, $square_size); //Create a new true color image 

    //Copy and resize part of an image with resampling 
    if(imagecopyresampled($new_canvas, $source, 0, 0, $x_offset, $y_offset, $square_size, $square_size, $s_size, $s_size)){ 
     save_image($new_canvas, $destination, $image_type, $quality); 
    } 

    return true; 
} 

##### Saves image resource to file ##### 
function save_image($source, $destination, $image_type, $quality){ 
    switch(strtolower($image_type)){//determine mime type 
     case 'image/png': 
      imagepng($source, $destination); return true; //save png file 
      break; 
     case 'image/gif': 
      imagegif($source, $destination); return true; //save gif file 
      break;   
     case 'image/jpeg': case 'image/pjpeg': 
      imagejpeg($source, $destination, $quality); return true; //save jpeg file 
      break; 
     default: return false; 
    } 
} 

?> 

Answer 1

問題就迎刃而解了：

代碼工作現在。圖像類型應該是整個MIME類型 - 圖像/ PNG，而不只是爲png

這是固定的代碼，希望它可以幫助別人：

<?php 
############ Configuration ############## 
$thumb_square_size  = 100; //Thumbnails will be cropped to 200x200 pixels 
$max_image_size = 520; //Maximum image size (height and width) 
$thumb_prefix = "small_"; //Normal thumb Prefix 
$destination_folder = 'uploads/'; //upload directory ends with/(slash) 
$jpeg_quality   = 90; //jpeg quality 
########################################## 


$upload_dir = "uploads/"; 
$img = $_POST['hidden_data']; 
$imageID = $_POST['imageID']; 
$img = str_replace('data:image/png;base64,', '', $img); 
$img = str_replace(' ', '+', $img); 
$data = base64_decode($img); 
$file = $upload_dir . "gillette_" . $imageID . ".png"; 
$success = file_put_contents($file, $data); 
print $success ? $file : 'Unable to save the file.'; 

$im = imagecreatefromstring($data); 

    if($im){ 


     $new_file_name = $imageID . ".png"; 
     $thumb_save_folder = $destination_folder . $thumb_prefix . $new_file_name; 

      //call crop_image_square() function to create square thumbnails 
      if(!crop_image_square($im, $thumb_save_folder, "image/png", $thumb_square_size, 520, 382, $jpeg_quality)) 
      { 
       die('Error Creating thumbnail'); 
      } 

     imagedestroy($im); //freeup memory 
    } 



##### This function corps image to create exact square, no matter what its original size! ###### 
function crop_image_square($source, $destination, $image_type, $square_size, $image_width, $image_height, $quality){ 
    if($image_width <= 0 || $image_height <= 0){return false;} //return false if nothing to resize 

    if($image_width > $image_height) 
    { 
     $y_offset = 0; 
     $x_offset = ($image_width - $image_height)/2; 
     $s_size  = $image_width - ($x_offset * 2); 
    }else{ 
     $x_offset = 0; 
     $y_offset = ($image_height - $image_width)/2; 
     $s_size = $image_height - ($y_offset * 2); 
    } 
    $new_canvas = imagecreatetruecolor($square_size, $square_size); //Create a new true color image 

    //Copy and resize part of an image with resampling 
    if(imagecopyresampled($new_canvas, $source, 0, 0, $x_offset, $y_offset, $square_size, $square_size, $s_size, $s_size)){ 
     save_image($new_canvas, $destination, $image_type, $quality); 
    } 

    return true; 
} 

##### Saves image resource to file ##### 
function save_image($source, $destination, $image_type, $quality){ 
    switch(strtolower($image_type)){//determine mime type 
     case 'image/png': 
      imagepng($source, $destination); return true; //save png file 
      break; 
     case 'image/gif': 
      imagegif($source, $destination); return true; //save gif file 
      break;   
     case 'image/jpeg': case 'image/pjpeg': 
      imagejpeg($source, $destination, $quality); return true; //save jpeg file 
      break; 
     default: return false; 
    } 
} 

?>