如何使用php调整文件夹中的图像大小？

Question

如何使用php调整文件夹中的图像大小？

我尝试使用此代码来调整图像的大小$imgPath ="test_images/english-728b1414843000.png";到200x200 px，但不工作，我该怎么做？

<?php 
    function resize($width, $height, $imgPath, $nm){ 
     /* Get original image x y*/ 
     list($w, $h) = getimagesize($_FILES[$nm]['tmp_name']); 
     /* calculate new image size with ratio */ 
     $ratio = max($width/$w, $height/$h); 
     $h = ceil($height/$ratio); 
     $x = ($w - $width/$ratio)/2; 
     $w = ceil($width/$ratio); 
     /* new file name */ 
     $path = $imgPath; 
     /* read binary data from image file */ 
     $imgString = file_get_contents($_FILES[$nm]['tmp_name']); 
     /* create image from string */ 
     $image = imagecreatefromstring($imgString); 
     $tmp = imagecreatetruecolor($width, $height); 
     //$nm = imagecreatetruecolor(400, 300); 
       imagealphablending($tmp, FALSE); 
       imagesavealpha($tmp, TRUE); 
     imagecopyresampled($tmp, $image, 
     0, 0, 
     $x, 0, 
     $width, $height, 
     $w, $h); 
     /* Save image */ 
     switch ($_FILES[$nm]['type']) { 
      case 'image/jpeg': 
       imagejpeg($tmp, $path, 100); 
       break; 
      case 'image/png': 
       imagepng($tmp, $path, 0); 
       break; 
      case 'image/gif': 
       imagegif($tmp, $path); 
       break; 
      default: 
       exit; 
       break; 
     } 
     return $path; 
     /* cleanup memory */ 
     imagedestroy($image); 
     imagedestroy($tmp); 
    } 
?> 



<?PHP 
    $imgPath ="test_images/english-728b1414843000.png"; 
     $valid_exts = array('jpeg', 'jpg', 'png', 'gif'); 
     // thumbnail sizes 
     $sizes = array(200 => 200); 
     $ext = strtolower(pathinfo($_FILES[$nm]['name'], PATHINFO_EXTENSION)); 
     if (in_array($ext, $valid_exts)) { 
      /* resize image */ 
      foreach ($sizes as $w => $h) { 
       $files[] = resize($w, $h, $imgPath ,$nm); 
      } 

     } 
?> 

Answer 1

请在htacess

RewriteCond %{REQUEST_FILENAME} !-f 
    RewriteCond %{REQUEST_FILENAME} !-d 
    RewriteRule ^p/(\d+)x(\d+)/(.*).(jpg|png)$ image.php?url=$3&ext=$4&height=$2&width=$1 [L,QSA] 

create image.php and put this code-- 
<?php 
include('smart_resize_image.function.php'); 

$newheight = (int) $_GET['height']; 
$newwidth = (int) $_GET['width']; 
$image = $_GET['url']; 
$ext = $_GET['ext']; 
$path = "{$image}.{$ext}"; 

// Content type 
header('Content-Type: image/jpeg'); 

$resizedFile = "p/{$newwidth}x{$newheight}/{$image}.{$ext}"; 

mkdir(dirname($resizedFile), 0755, true); 

$path = trimAndGet($path); //remove white/gray background around image 

smart_resize_image($path, null, $newwidth, $newheight, true, $resizedFile, false, false, 90); 

and use smart resize library 

Answer 2

$handle = opendir(dirname(realpath(__FILE__)) . '/thumbs/'); 
while ($file = readdir($handle)) { 
    if ($file !== '.' && $file !== '..') { 
     // echo '<img style="margin:10px;" src="pictures/' . $file . '" border="0" />'; 
     $ter = 'thumbs/' . $file; 
     $image = strtolower($ter); 
     $extname = getExtension($image); 
     if ($extname == "jpg" || $extname == "jpeg") { 
      $src = imagecreatefromjpeg($ter); 
     } else if ($extname == "png") { 
      $src = imagecreatefrompng($ter); 
     } else { 
      $src = imagecreatefromgif($ter); 
     } 
     list($width, $height) = getimagesize($ter); 
     $newwidth = 120; 
     $newheight = 140; 
     $tmp = imagecreatetruecolor($newwidth, $newheight); 
     imagecopyresampled($tmp, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); 
     $filepath = $file; 
     $filename = 'thumbs/' . $filepath; 
     imagejpeg($tmp, $filename, 100); 
     imagedestroy($src); 
     imagedestroy($tmp); 
    } 
} 

function getExtension($str) { 
    $i = strrpos($str, "."); 
    if (!$i) { 
     return ""; 
    } 
    $l = strlen($str) - $i; 
    $ext = substr($str, $i + 1, $l); 
    return $ext; 
} 

添加代码