Question

我正在通过ajax试验php脚本，该脚本从this source.

上传了一系列图片

虽然它工作得很好但我正在尝试输入php代码，它将图像的宽度或高度调整为120px（以较大者为准）。为了我的理智，请帮助如何更新代码：

$demo_mode = false;
$upload_dir = 'uploads/';
$allowed_ext = array('jpg','jpeg','png','gif');

if(strtolower($_SERVER['REQUEST_METHOD']) != 'post'){
    exit_status('Error! Wrong HTTP method!');
}

if(array_key_exists('pic',$_FILES) && $_FILES['pic']['error'] == 0 ){

    $pic = $_FILES['pic'];

    if(!in_array(get_extension($pic['name']),$allowed_ext)){
        exit_status('Only '.implode(',',$allowed_ext).' files are allowed!');
    }   

    if($demo_mode){

        // File uploads are ignored. We only log them.

        $line = implode('       ', array( date('r'), $_SERVER['REMOTE_ADDR'], $pic['size'], $pic['name']));
        file_put_contents('log.txt', $line.PHP_EOL, FILE_APPEND);

        exit_status('Uploads are ignored in demo mode.');
    }

    // Move the uploaded file from the temporary
    // directory to the uploads folder:

    if(move_uploaded_file($pic['tmp_name'], $upload_dir.$pic['name'])){
        exit_status('File was uploaded successfuly!');
    }

}

exit_status('Something went wrong with your upload!');

// Helper functions

function exit_status($str){
    echo json_encode(array('status'=>$str));
    exit;
}

function get_extension($file_name){
    $ext = explode('.', $file_name);
    $ext = array_pop($ext);
    return strtolower($ext);
}

Answer 1

您可以在服务器上安装imagemagick：

<?php
function resize_image($file, $w, $h, $crop=FALSE) {
    $img = new Imagick($file);
    if ($crop) {
        $img->cropThumbnailImage($w, $h);
    } else {
        $img->thumbnailImage($w, $h, TRUE);
    }

    return $img;
}
resize_image(‘/path/to/some/image.jpg’, 150, 150);

另一种方法是使用PHP-GD：

<?php
function resize_image($file, $w, $h, $crop=FALSE) {
    list($width, $height) = getimagesize($file);
    $r = $width / $height;
    if ($crop) {
        if ($width > $height) {
            $width = ceil($width-($width*($r-$w/$h)));
        } else {
            $height = ceil($height-($height*($r-$w/$h)));
        }
        $newwidth = $w;
        $newheight = $h;
    } else {
        if ($w/$h > $r) {
            $newwidth = $h*$r;
            $newheight = $h;
        } else {
            $newheight = $w/$r;
            $newwidth = $w;
        }
    }
    $src = imagecreatefromjpeg($file);
    $dst = imagecreatetruecolor($newwidth, $newheight);
    imagecopyresampled($dst, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

    return $dst;
}

$img = resize_image(‘/path/to/some/image.jpg’, 150, 150);

Answer 2

<?php
// The file
$filename = 'test.jpg';
$percent = 0.5;

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

// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

// Output
imagejpeg($image_p, null, 100);

在php.net

了解详情

Answer 3

好吧，我从这个LINK中拿了一个“promaty”的例子并从循环中调用：

<?php

$dir = "uploads/*.*";
$images = glob( $dir );

foreach( $images as $file ):
    $px = 120;
    $prefix = $px . "_";
    $dst = "uploads/" . $prefix . basename($file);
    $resized = image_resize($file, $dst, $px, $px);
    echo "<img src='" . $dst . "' />";
    echo "<p>" . basename($dst) . " </p>";
endforeach;

...谢谢你的时间。

如何在这个PHP脚本中调整图像大小？

3 个答案: