PHP+Ajax图片上传并且无刷新生成缩略图预览-PHP源码

XML/HTML Code

Javascript Code

processupload.php

PHP Code

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        /* 
        // Insert info into database table! 
        mysql_query("INSERT INTO myImageTable (ImageName, ThumbName, ImgPath) 
        VALUES ($DestRandImageName, $thumb_DestRandImageName, &＃39;uploads/&＃39;)"); 
        */  
  
    }else{  
        die(&＃39;Resize Error&＃39;); //output error  
    }  
}  
  
  
// This function will proportionally resize image   
function resizeImage($CurWidth,$CurHeight,$MaxSize,$DestFolder,$SrcImage,$Quality,$ImageType)  
{  
    //Check Image size is not 0  
    if($CurWidth <= 0 || $CurHeight <= 0)   
    {  
        return false;  
    }  
      
    //Construct a proportional size of new image  
    $ImageScale         = min($MaxSize/$CurWidth, $MaxSize/$CurHeight);   
    $NewWidth           = ceil($ImageScale*$CurWidth);  
    $NewHeight          = ceil($ImageScale*$CurHeight);  
    $NewCanves          = imagecreatetruecolor($NewWidth, $NewHeight);  
      
    // Resize Image  
    if(imagecopyresampled($NewCanves, $SrcImage,0, 0, 0, 0, $NewWidth, $NewHeight, $CurWidth, $CurHeight))  
    {  
        switch(strtolower($ImageType))  
        {  
            case &＃39;image/png&＃39;:  
                imagepng($NewCanves,$DestFolder);  
                break;  
            case &＃39;image/gif&＃39;:  
                imagegif($NewCanves,$DestFolder);  
                break;            
            case &＃39;image/jpeg&＃39;:  
            case &＃39;image/pjpeg&＃39;:  
                imagejpeg($NewCanves,$DestFolder,$Quality);  
                break;  
            default:  
                return false;  
        }  
    //Destroy image, frees memory     
    if(is_resource($NewCanves)) {imagedestroy($NewCanves);}   
    return true;  
    }  
  
}  
  
//This function corps image to create exact square images, no matter what its original size!  
function cropImage($CurWidth,$CurHeight,$iSize,$DestFolder,$SrcImage,$Quality,$ImageType)  
{      
    //Check Image size is not 0  
    if($CurWidth <= 0 || $CurHeight <= 0)   
    {  
        return false;  
    }  
      
    //abeautifulsite.net has excellent article about "Cropping an Image to Make Square bit.ly/1gTwXW9  
    if($CurWidth>$CurHeight)  
    {  
        $y_offset = 0;  
        $x_offset = ($CurWidth - $CurHeight) / 2;  
        $square_size    = $CurWidth - ($x_offset * 2);  
    }else{  
        $x_offset = 0;  
        $y_offset = ($CurHeight - $CurWidth) / 2;  
        $square_size = $CurHeight - ($y_offset * 2);  
    }  
      
    $NewCanves  = imagecreatetruecolor($iSize, $iSize);   
    if(imagecopyresampled($NewCanves, $SrcImage,0, 0, $x_offset, $y_offset, $iSize, $iSize, $square_size, $square_size))  
    {  
        switch(strtolower($ImageType))  
        {  
            case &＃39;image/png&＃39;:  
                imagepng($NewCanves,$DestFolder);  
                break;  
            case &＃39;image/gif&＃39;:  
                imagegif($NewCanves,$DestFolder);  
                break;            
            case &＃39;image/jpeg&＃39;:  
            case &＃39;image/pjpeg&＃39;:  
                imagejpeg($NewCanves,$DestFolder,$Quality);  
                break;  
            default:  
                return false;  
        }  
    //Destroy image, frees memory     
    if(is_resource($NewCanves)) {imagedestroy($NewCanves);}   
    return true;  
  
    }  
        
}

以上就是我们要介绍的ajax无刷新图片上传功能了，其实就是通过异步模式提交给php然后由php上传图片并且生成小图返回给指定的id的htm元素模块即可。