Php 如何更改函数以接受不同类型的文件？

我有这段代码，它可以帮助我创建一个JPEG图像，现在，我需要的是创建一个图像，PNG JPG，或任何它是

我做了一些修改，最后的结果如下：

function tamano_nuevo_foto($im_or, $ancho_nv, $dir_nv) {
    $ext   = pathinfo($im_or, PATHINFO_EXTENSION);
    $datos = getimagesize($im_or);

    $ancho = $datos[0];

    $alto = $datos[1];

    if ($ancho > $ancho_nv) { //Si la imagen no lelga al máximo no la tocamos.
        $prop    = $alto / $ancho;
        $alto_nv = round($ancho_nv * $prop); //Sacamos la nueva altura
    } else {

        $ancho_nv = $ancho;

        $alto_nv = $alto;
    }

    $im_nv = imagecreatetruecolor($ancho_nv, $alto_nv);

    imagecopyresampled($im_nv, $img, 0, 0, 0, 0, $ancho_nv, $alto_nv, $ancho, $alto);
    switch ($ext) {
        case 'jpg':
            $img = imagecreatefromjpeg($im_or);
            break;
        case 'jpeg':
            $img = imagecreatefromjpeg($im_or);
            break;
        case 'png':
            $img = imagecreatefrompng($im_or);
            break;
        case 'gif':
            $img = imagecreatefromgif($im_or);
            break;
        default:
            $img = imagecreatefromjpeg($im_or);
    }
    imagedestroy($im_nv);
}

原代码为：

function tamano_nuevo_foto($im_or, $ancho_nv, $dir_nv) {
    $img   = imagecreatefromstring($im_or);
    $datos = getimagesize($im_or);
    $ancho = $datos[0];
    $alto  = $datos[1];
    if ($ancho > $ancho_nv) { //Si la imagen no lelga al máximo no la tocamos.
        $prop    = $alto / $ancho; /* Calculo la proporcion entre la or y la nv (lo miltiplicamos por mil para evitar problemas con decimales */
        $alto_nv = round($ancho_nv * $prop); //Sacamos la nueva altura
    } else {
        $ancho_nv = $ancho;
        $alto_nv  = $alto;
    }
    $im_nv    = imagecreatetruecolor($ancho_nv, $alto_nv);
    imagecopyresampled($im_nv, $img, 0, 0, 0, 0, $ancho_nv, $alto_nv, $ancho, $alto);
    imagejpeg($im_nv, $dir_nv);
    imagedestroy($im_nv);
}

该函数创建如下所示：

$tempFile = $_FILES['Filedata']['tmp_name'];
$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
$targetPath =  str_replace('//','/',$targetPath);
$targetFile =  $targetPath . $_FILES['Filedata']['name'];
tamano_nuevo_foto($tempFile, 800, $targetFile);

function tamano_nuevo_foto($im_or, $width_nv, $dir_nv) {
    list($width, $height, $type, $attr) = getimagesize($im_or);

    $x_ratio = $width_nv / $width; 
    if($width <= $width_nv) { 
        $width_nv = $width; 
        $height_nv = $height; 
    } else { 

        $height_nv = ceil($height * $x_ratio);
    } 

    $im_nv = imagecreatetruecolor($width_nv, $height_nv);
    switch ($type) {
        case '3':
            imagealphablending($im_nv, false);
            imagesavealpha($im_nv, true); 

            $im_or = imagecreatefrompng($im_or);
            imagealphablending($im_or, true);

            header("Content-Type: image/png");
            imagecopyresampled($im_nv, $im_or, 0, 0, 0, 0, $width_nv, $height_nv, $width, $height);
            imagepng($im_nv, $dir_nv);
            break;
        case '1':
            $im_or = imagecreatefromgif($im_or);
            header("Content-Type: image/gif");
            imagecopyresampled($im_nv, $im_or, 0, 0, 0, 0, $width_nv, $height_nv, $width, $height);
            imagegif($im_nv, $dir_nv);
            break;
        default:
            $im_or = imagecreatefromjpeg($im_or);
            header("Content-Type: image/jpeg");
            imagecopyresampled($im_nv, $im_or, 0, 0, 0, 0, $width_nv, $height_nv, $width, $height);
            imagejpeg($im_nv, $dir_nv, 100);
    }


    imagedestroy($im_nv);
}

---

在我看来，在创建图像资源之前，您正在使用

$img

变量：

    imagecopyresampled($im_nv, $img, 0, 0, 0, 0, $ancho_nv, $alto_nv, $ancho, $alto);
    //^^ using $img 
    switch ($ext)
    {//creating img here...
        case 'jpg':
            $img = imagecreatefromjpeg($im_or);
            break;
        case 'jpeg':
            $img = imagecreatefromjpeg($im_or);
            break;
        case 'png':
            $img = imagecreatefrompng($im_or);
            break;
        case 'gif':
            $img = imagecreatefromgif($im_or);
            break;
        default:
            $img = imagecreatefromjpeg($im_or);
    }

只需将

imagecopyresampled

向下移动，就在开关之后。顺便说一句，这个开关可以写得不那么笨重：

    switch ($ext)
    {//creating img here...
        case 'png':
            $img = imagecreatefrompng($im_or);
            break;
        case 'gif':
            $img = imagecreatefromgif($im_or);
            break;
        default://no cases for jpg or jpeg means default, which creates from jpeg
            $img = imagecreatefromjpeg($im_or);
    }
    imagecopyresampled($im_nv, $img, 0, 0, 0, 0, $ancho_nv, $alto_nv, $ancho, $alto);

如果出于某种原因希望保留这些

jpeg

案例，则无需编写两次相同的代码，这要感谢fall-through：

    switch ($ext)
    {//creating img here...
        case 'jpeg':
            //you can even add some code specifically for the jpeg
            // extention, that will not be executed if the extention is jpg
            //if you omit the break at the end, the next case will be executed, too 
        case 'jpg':
            $img = imagecreatefromjpeg($im_or);
        break;
        case 'png':
            $img = imagecreatefrompng($im_or);
            break;
        case 'gif':
            $img = imagecreatefromgif($im_or);
            break;
        default://no cases for jpg or jpeg means default, which creates from jpeg
            $img = imagecreatefromjpeg($im_or);
    }
    imagecopyresampled($im_nv, $img, 0, 0, 0, 0, $ancho_nv, $alto_nv, $ancho, $alto);

---

你是说你想要这样：

$tempFile = $_FILES['Filedata']['tmp_name'];
$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
$targetPath =  str_replace('//','/',$targetPath);
$targetFile =  $targetPath . $_FILES['Filedata']['name'];
tamano_nuevo_foto($tempFile, 800, $targetFile);

function tamano_nuevo_foto($im_or, $width_nv, $dir_nv) {
    list($width, $height, $type, $attr) = getimagesize($im_or);

    $x_ratio = $width_nv / $width; 
    if($width <= $width_nv) { 
        $width_nv = $width; 
        $height_nv = $height; 
    } else { 

        $height_nv = ceil($height * $x_ratio);
    } 

    $im_nv = imagecreatetruecolor($width_nv, $height_nv);
    switch ($type) {
        case '3':
            imagealphablending($im_nv, false);
            imagesavealpha($im_nv, true); 

            $im_or = imagecreatefrompng($im_or);
            imagealphablending($im_or, true);

            header("Content-Type: image/png");
            imagecopyresampled($im_nv, $im_or, 0, 0, 0, 0, $width_nv, $height_nv, $width, $height);
            imagepng($im_nv, $dir_nv);
            break;
        case '1':
            $im_or = imagecreatefromgif($im_or);
            header("Content-Type: image/gif");
            imagecopyresampled($im_nv, $im_or, 0, 0, 0, 0, $width_nv, $height_nv, $width, $height);
            imagegif($im_nv, $dir_nv);
            break;
        default:
            $im_or = imagecreatefromjpeg($im_or);
            header("Content-Type: image/jpeg");
            imagecopyresampled($im_nv, $im_or, 0, 0, 0, 0, $width_nv, $height_nv, $width, $height);
            imagejpeg($im_nv, $dir_nv, 100);
    }


    imagedestroy($im_nv);
}

函数tamano\u nuevo\u foto（$im\u或，$width\u nv，$dir\u nv）{
列表（$width、$height、$type、$attr）=getimagesize（$im_或）；
$x_比率=$width_nv/$width；
如果（$width，谢谢！现在已经完成了格式设置，您能看看我的问题吗？：）是的，新的格式化代码，我创建的新函数，它不会创建图像..没有显示错误，但没有创建图像，我对原始代码进行了一些修改，但我不知道我做错了什么！是的，我是说我解释了为什么我修改代码，以便能够创建不同类型的图像，但它不起作用我已经把它放好了！我想知道哪里可能错了！我想知道您是否需要所有这些函数（
imagecreatefrom[x]
）单独定义，或者如果你可以修改一个可以接受扩展名的文件。是的，很好，但我只能这样理解。我不知道如何修改它。不幸的是，当我插入一个png文件时，它会上传一个黑色文件。我的意思是它不能与png一起工作。我尝试过这个，嗯，这无法识别扩展名，请让我告诉您我是否获得了扩展路径ok！$im_或等于：$tempFile=$_FILES['Filedata']['tmp_name']；是的，也请让我更新问题，以便您查看是什么创建了函数！我已经更新了我的问题，我想我在查找文件扩展名时出错了。。