快速調整大小圖片工具/腳本

Question

我有很多圖像（500,000 +）在日期組織的服務器上的文件夾中。我製作了一個PHP腳本來複制和裁剪子文件夾（thumb）上的每個JPG文件，但由於PHP不支持多線程，所以速度很慢。

我需要關於如何進行的建議。 Python是一個很好的選擇嗎？有沒有好的工具，或者我該如何改進我的調整大小功能？

您還可以看看我的PHP Code

Answer 1

你可以在PHP中做到沒有任何問題，模擬線程，而不是直接使用它們。實際上，PHP沒有本地線程（你可以事件使用庫，但在你的情況下這不是很有用）。

在你的代碼，而不是調用：

static::Crop($file,$destination,$tn_w = 300,$tn_h =200,$quality = 100,$wmsource = false); 

爲什麼不這樣做：

$array = array($file, $destination, $tn_w = 300, $tn_h = 200, $quality = 100, $wmsource = 0); 
$command = "/usr/bin/php crop.php"; 
foreach ($array as $arg) 
{ 
    $command .= ' ' . escapeshellarg($arg); 
} 
exec("$command &"); // note the & which release your execution 
usleep(100000); 

，你把你的裁剪功能裏面crop.php，然後調用它像：

list($exec, $file, $destination, $tn_w, $tn_h, $quality, $wmsource) = $argv; 
static::Crop($file,$destination,$tn_w = 300,$tn_h =200,$quality = 100,$wmsource = false); 

這將完成這項工作。

如果您想避免睡眠並控制同時運行多少個作物，您也可以使用文件模擬互斥體，這真的取決於您。你絕對可以在PHP中做這樣的工作。

Answer 2

但是PHP CGI支持多線程。爲什麼不使用exec（）？或者你可以使用shell腳本並進行轉換php cgi？

Answer 3

通過使用這個類

<?php 
class thumbnail_images { 

// get 
var $PathImgOld; 
var $PathImgNew; 
var $NewWidth; 
var $NewHeight; 

// tmp 
var $mime; 

function imagejpeg_new ($NewImg,$path_img) { 
    if ($this->mime == 'image/jpeg' or $this->mime == 'image/pjpeg') imagejpeg($NewImg,$path_img); 
    elseif ($this->mime == 'image/gif') imagegif($NewImg, $path_img); 
    elseif ($this->mime == 'image/png') imagepng($NewImg, $path_img); 
    else return(false); 
    return(true); 
} 

function imagecreatefromjpeg_new($path_img) { 
    if ($this->mime == 'image/jpeg' or $this->mime == 'image/pjpeg') $OldImg = imagecreatefromjpeg($path_img); 
    elseif ($this->mime == 'image/gif') $OldImg = imagecreatefromgif($path_img); 
    elseif ($this->mime == 'image/png') $OldImg = imagecreatefrompng($path_img); 
    else return(false); 
    return($OldImg); 
} 

function create_thumbnail_images() { 
    $PathImgOld = $this->PathImgOld; 
    $PathImgNew = $this->PathImgNew; 
    $NewWidth = $this->NewWidth; 
    $NewHeight = $this->NewHeight; 

    $Oldsize = @getimagesize($PathImgOld); 
    $this->mime = $Oldsize['mime']; 
    $OldWidth = $Oldsize[0]; 
    $OldHeight = $Oldsize[1]; 

    if ($NewHeight == '' and $NewWidth != '') { 
     $NewHeight = ceil(($OldHeight * $NewWidth)/$OldWidth); 
    } 
    elseif ($NewWidth == '' and $NewHeight != '') { 
     $NewWidth = ceil(($OldWidth * $NewHeight)/$OldHeight); 
    } 
    elseif ($NewHeight == '' and $NewWidth == '') { 
     return(false); 
    } 

    $OldHeight_castr = ceil(($OldWidth * $NewHeight)/$NewWidth); 
    $castr_bottom = ($OldHeight - $OldHeight_castr)/2; 

    $OldWidth_castr = ceil(($OldHeight * $NewWidth)/$NewHeight); 
    $castr_right = ($OldWidth - $OldWidth_castr)/2; 

    if ($castr_bottom>0) { 
     $OldWidth_castr = $OldWidth; 
     $castr_right = 0; 
    } 
    elseif ($castr_right>0) { 
     $OldHeight_castr = $OldHeight; 
     $castr_bottom = 0; 
    } 
    else { 
     $OldWidth_castr = $OldWidth; 
     $OldHeight_castr = $OldHeight; 
     $castr_right = 0; 
     $castr_bottom = 0; 
    } 

    $OldImg = $this->imagecreatefromjpeg_new($PathImgOld); 
    if ($OldImg) { 
     $NewImg_castr = imagecreatetruecolor($OldWidth_castr, $OldHeight_castr); 
     if ($NewImg_castr) { 
      imagecopyresampled($NewImg_castr, $OldImg, 0, 0, $castr_right, $castr_bottom, $OldWidth_castr, $OldHeight_castr, $OldWidth_castr, $OldHeight_castr); 
      $NewImg = imagecreatetruecolor($NewWidth, $NewHeight); 
      if ($NewImg) { 
       imagecopyresampled($NewImg, $NewImg_castr, 0, 0, 0, 0, $NewWidth, $NewHeight, $OldWidth_castr, $OldHeight_castr); 
       imagedestroy($NewImg_castr); 
       imagedestroy($OldImg); 
       if (!$this->imagejpeg_new($NewImg, $PathImgNew)) return (false); 
       imagedestroy($NewImg); 
      } 
     } 
    } 
    else { 
     return(false); 
    } 

    return(true); 
} 

} 
?> 

現在用它

$width = $_REQUEST['img_width']; 
$height = $_REQUEST['img_height']; 
// example 
$obj_img = new thumbnail_images(); 
$obj_img->PathImgOld = 'Old_image.jpg'; // Image for resize 
$obj_img->PathImgNew = 'my_image_new_formSubURLkki.jpg'; // New Image Path 
$obj_img->NewWidth = $width; 
$obj_img->NewHeight = $height; 
if (!$obj_img->create_thumbnail_images()) echo "error"; 
else { 
    echo 'Image Maked andsave in directory'; 
}