How do you detect image MIME type of an image in a directory?

**Jedi121** · Jul 17 '05, 04:21 AM

Re: How do you detect image MIME type of an image in a directory?

Phil Powell a écrit le 22/03/2004 :[color=blue]
> How do you detect an image MIME type if you know of the image in a
> directory? For example, I know of:
>
> [PHP]
> if (is_file("$myIm agePath/$myImageName")) { // FIND MIME TYPE BUT HOW
> I DUNNO
> }
> [/PHP]
>
> The only way I could think of was to determine the extension of the
> image and search through /etc/mime.types, which is horrifically
> impractical but the only thing I can think of. What would you suggest
> I do?
>
> Thanx
> Phil[/color]

Read manual : http://www.php.net/mime-content-type

mime_content_ty pe
(PHP 4 >= 4.3.0)

mime_content_ty pe()

**Chung Leong** · Jul 17 '05, 04:21 AM

Re: How do you detect image MIME type of an image in a directory?

Use getimagesize(). It's much more efficient than going through the "magic"
list when you know you have an image on your hand. The function returns an
array. The 'mime' element gives you the mime-type.

See http://www.php.net/manual/en/function.getimagesize.php

Uzytkownik "Phil Powell" <soazine@erols. com> napisal w wiadomosci
news:1cdca2a7.0 403221426.776e1 889@posting.goo gle.com...[color=blue]
> How do you detect an image MIME type if you know of the image in a
> directory? For example, I know of:
>
> [PHP]
> if (is_file("$myIm agePath/$myImageName")) { // FIND MIME TYPE BUT HOW
> I DUNNO
> }
> [/PHP]
>
> The only way I could think of was to determine the extension of the
> image and search through /etc/mime.types, which is horrifically
> impractical but the only thing I can think of. What would you suggest
> I do?
>
> Thanx
> Phil[/color]

**Phil Powell** · Jul 17 '05, 04:21 AM

Re: How do you detect image MIME type of an image in a directory?

My apologies, I led all of you in the wrong direction on this.

Problem comes with this: I want to change the name of an image to
something else.

Let's say I have /images/my_image.jpg

And I want to change it to: /images/my_image.xls

Obviously that would work in PHP but when your browser tries to access
it it would think it's an Excel spreadsheet and not an image and
damage ensues.... or worse, change to: /images/my_image.pif -> YIKES!

Anyway, what I have to do is this: when I decide to change image
metadata such as the image name, I have to be sure that the name that
I change the image name to is an actual "image"-like name, in other
words, if I change it to "my_image.e xt" then "my_image.e xt" *must* be
of a valid MIME type for an image before it is allowed to change the
name of the image to that name.

And I'm sorry but getimagesize(), in this case, can't help me at all.

Phil

"Chung Leong" <chernyshevsky@ hotmail.com> wrote in message news:<V7OdncMua 6jyMcLdRVn-jw@comcast.com> ...[color=blue]
> Use getimagesize(). It's much more efficient than going through the "magic"
> list when you know you have an image on your hand. The function returns an
> array. The 'mime' element gives you the mime-type.
>
> See http://www.php.net/manual/en/function.getimagesize.php
>
> Uzytkownik "Phil Powell" <soazine@erols. com> napisal w wiadomosci
> news:1cdca2a7.0 403221426.776e1 889@posting.goo gle.com...[color=green]
> > How do you detect an image MIME type if you know of the image in a
> > directory? For example, I know of:
> >
> > [PHP]
> > if (is_file("$myIm agePath/$myImageName")) { // FIND MIME TYPE BUT HOW
> > I DUNNO
> > }
> > [/PHP]
> >
> > The only way I could think of was to determine the extension of the
> > image and search through /etc/mime.types, which is horrifically
> > impractical but the only thing I can think of. What would you suggest
> > I do?
> >
> > Thanx
> > Phil[/color][/color]

**Alvaro G Vicario** · Jul 17 '05, 04:21 AM

Re: How do you detect image MIME type of an image in a directory?

*** Phil Powell wrote/escribió (23 Mar 2004 07:33:06 -0800):[color=blue]
> Let's say I have /images/my_image.jpg
>
> And I want to change it to: /images/my_image.xls
>
> Obviously that would work in PHP but when your browser tries to access
> it it would think it's an Excel spreadsheet and not an image and
> damage ensues....[/color]

Browser will think it is whatever web server tells it is. When sending the
file server adds the appropriate Content-Type header. By default, web
server normally checks file extension and finds a MIME value in a chart. If
you want to change this you can either disconfigure your web server (not
recommended) or write a script to serve contents:

header('Content-Type: image/jpeg')
readfile('/home/site/htdocs/images/my_image.pif')

--
--
-- Álvaro G. Vicario - Burgos, Spain
--

**Phil Powell** · Jul 17 '05, 04:21 AM

Re: How do you detect image MIME type of an image in a directory?

Alvaro G Vicario <alvaro_QUITAR_ REMOVE@telecomp uteronline.com> wrote in message news:<1flb87bq6 ahkn$.2hy5wwc9e lfq.dlg@40tude. net>...[color=blue]
> *** Phil Powell wrote/escribió (23 Mar 2004 07:33:06 -0800):[color=green]
> > Let's say I have /images/my_image.jpg
> >
> > And I want to change it to: /images/my_image.xls
> >
> > Obviously that would work in PHP but when your browser tries to access
> > it it would think it's an Excel spreadsheet and not an image and
> > damage ensues....[/color]
>
> Browser will think it is whatever web server tells it is. When sending the
> file server adds the appropriate Content-Type header. By default, web
> server normally checks file extension and finds a MIME value in a chart. If
> you want to change this you can either disconfigure your web server (not
> recommended) or write a script to serve contents:
>
> header('Content-Type: image/jpeg')
> readfile('/home/site/htdocs/images/my_image.pif')
>
>
>[/color]

Ouch! I can't do that, the code will have redirects as well, a
header() tag would throw nasty warnings indicating that I am
overwriting the header information.

Phil
[color=blue]
>
> --[/color]

**Chung Leong** · Jul 17 '05, 04:22 AM

Re: How do you detect image MIME type of an image in a directory?

Uzytkownik "Phil Powell" <soazine@erols. com> napisal w wiadomosci
news:1cdca2a7.0 403230733.445de 2d5@posting.goo gle.com...[color=blue]
> My apologies, I led all of you in the wrong direction on this.
>
> Problem comes with this: I want to change the name of an image to
> something else.
>
> Let's say I have /images/my_image.jpg
>
> And I want to change it to: /images/my_image.xls
>
> Obviously that would work in PHP but when your browser tries to access
> it it would think it's an Excel spreadsheet and not an image and
> damage ensues.... or worse, change to: /images/my_image.pif -> YIKES!
>
> Anyway, what I have to do is this: when I decide to change image
> metadata such as the image name, I have to be sure that the name that
> I change the image name to is an actual "image"-like name, in other
> words, if I change it to "my_image.e xt" then "my_image.e xt" *must* be
> of a valid MIME type for an image before it is allowed to change the
> name of the image to that name.
>
> And I'm sorry but getimagesize(), in this case, can't help me at all.[/color]

Nothing can help those who don't wish to be helped. Look at the
documentation of getimagesize(). If you don't see a solution to your
problem, then you should quit programming altogether.

**Phil Powell** · Jul 17 '05, 04:25 AM

Re: How do you detect image MIME type of an image in a directory?

I found it, mime_content_ty pe(), provided your version and instance of
PHP has magic.mime installed and instantiated within php.ini upon PHP
installation.

Phil

"Chung Leong" <chernyshevsky@ hotmail.com> wrote in message news:<oI2dnd28I p1DYv3dRVn-gw@comcast.com> ...[color=blue]
> Uzytkownik "Phil Powell" <soazine@erols. com> napisal w wiadomosci
> news:1cdca2a7.0 403230733.445de 2d5@posting.goo gle.com...[color=green]
> > My apologies, I led all of you in the wrong direction on this.
> >
> > Problem comes with this: I want to change the name of an image to
> > something else.
> >
> > Let's say I have /images/my_image.jpg
> >
> > And I want to change it to: /images/my_image.xls
> >
> > Obviously that would work in PHP but when your browser tries to access
> > it it would think it's an Excel spreadsheet and not an image and
> > damage ensues.... or worse, change to: /images/my_image.pif -> YIKES!
> >
> > Anyway, what I have to do is this: when I decide to change image
> > metadata such as the image name, I have to be sure that the name that
> > I change the image name to is an actual "image"-like name, in other
> > words, if I change it to "my_image.e xt" then "my_image.e xt" *must* be
> > of a valid MIME type for an image before it is allowed to change the
> > name of the image to that name.
> >
> > And I'm sorry but getimagesize(), in this case, can't help me at all.[/color]
>
> Nothing can help those who don't wish to be helped. Look at the
> documentation of getimagesize(). If you don't see a solution to your
> problem, then you should quit programming altogether.[/color]

How do you detect image MIME type of an image in a directory?

How do you detect image MIME type of an image in a directory?

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