Using passthru() to download file results in broken/modified file
I have an PHP Yii2 webapplication, which runs an command line script using passthru(). The passthru() result should passed into an downloaded file, so that the user can download the output of passthru().
Example:
If I execute the following command line:
$ /bin/cat /PATH/pic.jpg > output.jpg
...I get an file output.jpg, which is identical to pic.jpg (same md5 checksum)
But I need to execute this mechanism in an web application:
If I doing the same using passthru() in order to send the file to the users browser:
header("Cache-Control: private");
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=download.jpg");
passthru ('/bin/cat /PATH/pic.jpg');
....than I get an download.jpg which is not the same like pic.jpg
I this example-case download.jpg is 1126 bytes smaller (picture size is around 13MBytes) and the picture can not be opend in some picture viewer.
php download yii2 header passthru
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
add a comment |
I have an PHP Yii2 webapplication, which runs an command line script using passthru(). The passthru() result should passed into an downloaded file, so that the user can download the output of passthru().
Example:
If I execute the following command line:
$ /bin/cat /PATH/pic.jpg > output.jpg
...I get an file output.jpg, which is identical to pic.jpg (same md5 checksum)
But I need to execute this mechanism in an web application:
If I doing the same using passthru() in order to send the file to the users browser:
header("Cache-Control: private");
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=download.jpg");
passthru ('/bin/cat /PATH/pic.jpg');
....than I get an download.jpg which is not the same like pic.jpg
I this example-case download.jpg is 1126 bytes smaller (picture size is around 13MBytes) and the picture can not be opend in some picture viewer.
php download yii2 header passthru
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
Is there any reason why you're not usingreadfile()here?
– rob006
Nov 14 '18 at 15:35
1
@rob006 This is only an example to simplify/show the problem. In "reallife"pic.jpgdoes not exist anpassthru()is calling an executable, which generates the binary stuff, which should be send to the user, which see the download in the browser.
– The Bndr
Nov 15 '18 at 12:08
add a comment |
I have an PHP Yii2 webapplication, which runs an command line script using passthru(). The passthru() result should passed into an downloaded file, so that the user can download the output of passthru().
Example:
If I execute the following command line:
$ /bin/cat /PATH/pic.jpg > output.jpg
...I get an file output.jpg, which is identical to pic.jpg (same md5 checksum)
But I need to execute this mechanism in an web application:
If I doing the same using passthru() in order to send the file to the users browser:
header("Cache-Control: private");
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=download.jpg");
passthru ('/bin/cat /PATH/pic.jpg');
....than I get an download.jpg which is not the same like pic.jpg
I this example-case download.jpg is 1126 bytes smaller (picture size is around 13MBytes) and the picture can not be opend in some picture viewer.
php download yii2 header passthru
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
I have an PHP Yii2 webapplication, which runs an command line script using passthru(). The passthru() result should passed into an downloaded file, so that the user can download the output of passthru().
Example:
If I execute the following command line:
$ /bin/cat /PATH/pic.jpg > output.jpg
...I get an file output.jpg, which is identical to pic.jpg (same md5 checksum)
But I need to execute this mechanism in an web application:
If I doing the same using passthru() in order to send the file to the users browser:
header("Cache-Control: private");
header("Content-Type: application/octet-stream");
header("Content-Disposition: attachment; filename=download.jpg");
passthru ('/bin/cat /PATH/pic.jpg');
....than I get an download.jpg which is not the same like pic.jpg
I this example-case download.jpg is 1126 bytes smaller (picture size is around 13MBytes) and the picture can not be opend in some picture viewer.
php download yii2 header passthru
php download yii2 header passthru
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
edited Nov 14 '18 at 15:02
The Bndr
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
asked Nov 14 '18 at 10:29
The BndrThe Bndr
7,665124687
7,665124687
Is there any reason why you're not usingreadfile()here?
– rob006
Nov 14 '18 at 15:35
1
@rob006 This is only an example to simplify/show the problem. In "reallife"pic.jpgdoes not exist anpassthru()is calling an executable, which generates the binary stuff, which should be send to the user, which see the download in the browser.
– The Bndr
Nov 15 '18 at 12:08
add a comment |
Is there any reason why you're not usingreadfile()here?
– rob006
Nov 14 '18 at 15:35
1
@rob006 This is only an example to simplify/show the problem. In "reallife"pic.jpgdoes not exist anpassthru()is calling an executable, which generates the binary stuff, which should be send to the user, which see the download in the browser.
– The Bndr
Nov 15 '18 at 12:08
Is there any reason why you're not using
readfile() here?– rob006
Nov 14 '18 at 15:35
Is there any reason why you're not using
readfile() here?– rob006
Nov 14 '18 at 15:35
1
1
@rob006 This is only an example to simplify/show the problem. In "reallife"
pic.jpg does not exist an passthru() is calling an executable, which generates the binary stuff, which should be send to the user, which see the download in the browser.– The Bndr
Nov 15 '18 at 12:08
@rob006 This is only an example to simplify/show the problem. In "reallife"
pic.jpg does not exist an passthru() is calling an executable, which generates the binary stuff, which should be send to the user, which see the download in the browser.– The Bndr
Nov 15 '18 at 12:08
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53298019%2fusing-passthru-to-download-file-results-in-broken-modified-file%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53298019%2fusing-passthru-to-download-file-results-in-broken-modified-file%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Is there any reason why you're not using
readfile()here?– rob006
Nov 14 '18 at 15:35
1
@rob006 This is only an example to simplify/show the problem. In "reallife"
pic.jpgdoes not exist anpassthru()is calling an executable, which generates the binary stuff, which should be send to the user, which see the download in the browser.– The Bndr
Nov 15 '18 at 12:08