How to remove extension from string only real extension

Question

I m looking for a small function that allows me to remove the extension from a filename   I ve found many examples by googling  but they are bad  because they just remove part of the string with       They use dot for limiter and just cut string   Look at these scripts    from   preg replace                  from     or    from substr  from  0   strlen   from   -  strlen  strrchr  filename            When we add the string like this      This is example of somestring   It will return only  This      The extension can have 3 or 4 characters  so we have to check if dot is on 4 or 5 position  and then remove it   How can it be done

User · Answer

As others mention  the idea of limiting extension to a certain number of characters is invalid   Going with the idea of array pop  thinking of a delimited string as an array  this function has been useful to me     function string pop  string   delimiter        a   explode  delimiter   string       array pop  a       return implode  delimiter   a       Usage    filename    pic of my house jpeg    name   string pop  filename        echo  name    Outputs   pic of my house   note it leaves valid  non-extension     characters alone    In action   http   sandbox onlinephpfunctions com code 5d12a96ea548f696bd097e2986b22de7628314a0

User · Answer

Try this one    withoutExt   preg replace           s  3 4           filename     So  this matches a dot followed by three or four characters which are not a dot or a space  The  3 or 4  rule should probably be relaxed  since there are plenty of file extensions which are shorter or longer

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There are a few ways to do it  but i think one of the quicker ways is the following      filename has the file name you have under the picture  temp   explode        filename     ext   array pop   temp     name   implode        temp      Another solution is this  I havent tested it  but it looks like it should work for multiple periods in a filename   name   substr  filename  0   strlen   filename   -  strlen  strrchr  filename            Also    info   pathinfo   filename     name    info  filename     ext     info  extension        Or in PHP 5 4  i believe this should work  name   pathinfo   filename     filename       In all of these   name contains the filename without the extension

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Landed on this page for looking for the fastest way to remove the extension from a number file names from a glob   result  So I did some very rudimentary benchmark tests and found this was the quickest method  It was less than half the time of preg replace     result   substr  fileName 0 -4   Now I know that all of the files in my glob   have a  zip extension  so I could do this  If the file extension is unknown with an unknown length  the following method will work and is still about 20  faster that preg replace    That is  so long as there is an extension   result   substr  fileName 0 strrpos  fileName        The basic benchmark test code and the results   start   microtime true     loop   10000000   fileName    a LONG-filename forTest zip    result      1 82sec preg replace   unknown ext   do          result   preg replace           s  3 4         fileName       while -- loop       1 7sec preg replace   known ext   do          result   preg replace    zip        fileName       while -- loop       4 57sec  - pathinfo   do          result   pathinfo  fileName PATHINFO FILENAME       while -- loop       2 43sec explode and implode   do          result   implode     explode      fileName -1        while -- loop       3 74sec basename  known ext   do          result   basename  fileName   zip        while -- loop       1 45sec strpos unknown ext   do          result   substr  fileName 0 strrpos  fileName            while -- loop       0 73sec strpos - known ext length do        result   substr  fileName 0 -4     while -- loop    var dump  fileName   var dump  result   echo  Time     microtime true  -  start        exit

User · Answer

This is a rather easy solution and will work no matter how long the extension or how many dots or other characters are in the string    filename    abc def jpg     newFileName   substr  filename  0    strrpos  filename              newFileName will now be abc def   Basically this just looks for the last occurrence of   and then uses substring to retrieve all the characters up to that point    It s similar to one of your googled examples but simpler  faster and easier than regular expressions and the other examples  Well imo anyway  Hope it helps someone

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http   php net manual en function pathinfo php   filename   pathinfo  filename md txt   PATHINFO FILENAME      returns  filename md

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Use PHP basename     PHP 4  PHP 5   var dump basename  test php     php      Outputs  string 4   test

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EDIT   The smartest approach IMHO  it removes the last point and following text from a filename  aka the extension     name   basename  filename        end explode       filename       Cheers

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image name    this-is file name jpg    last dot index   strrpos  image name         without extention   substr  image name  0   last dot index     Output   this-is file name

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You can set the length of the regular expression pattern by using the  x y  operator   3 4  would match if the preceeding pattern occurs 3 or 4 times    But I don t think you really need it  What will you do with a file named  This is

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From the manual  pathinfo    lt  php      path parts   pathinfo   www htdocs index html         echo  path parts  dirname      n       echo  path parts  basename      n       echo  path parts  extension      n       echo  path parts  filename      n      Since PHP 5 2 0   gt    It doesn t have to be a complete path to operate properly  It will just as happily parse file jpg as  path to my file jpg

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The following code works well for me  and it s pretty short  It just breaks the file up into an array delimited by dots  deletes the last element  which is hypothetically the extension   and reforms the array with the dots again    filebroken   explode        filename    extension   array pop  filebroken    fileTypeless   implode       filebroken

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You could use what PHP has built in to assist      withoutExt   pathinfo  path  PATHINFO DIRNAME          pathinfo  path  PATHINFO FILENAME     Though if you are only dealing with a filename   somefile jpg   you will get          somefile   See it on CodePad org  Or use a regex      withoutExt   preg replace         preg quote pathinfo  path  PATHINFO EXTENSION                     path     See it on CodePad org  If you don t have a path  but just a filename  this will work and be much terser      withoutExt   pathinfo  path  PATHINFO FILENAME     See it on CodePad org  Of course  these both just look for the last period

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Use this   strstr  filename ext      true     result filename

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Recommend use  pathinfo with PATHINFO FILENAME   filename    abc 123 filename html    without extension   pathinfo  filename  PATHINFO FILENAME

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Try to use this one  it will surely remove the file extension     filename    image jpg    e   explode       filename   foreach  e as  key  gt  d    if  d  end  e      new d    d          echo implode  -   new t       result would be just the  image

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This works when there is multiple parts to an extension and is both short and efficient   function removeExt  path         basename   basename  path       return strpos  basename           false    path   substr  path  0  - strlen  basename    strlen explode       basename  0        echo removeExt  https   example com file php       https   example com file echo removeExt  https   example com file tar gz       https   example com file echo removeExt  file tar gz       file echo removeExt  file       file

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I found many examples on the Google but there are bad because just remove part of string with       Actually that is absolutely the correct thing to do  Go ahead and use that   The file extension is everything after the last dot  and there is no requirement for a file extension to be any particular number of characters  Even talking only about Windows  it already comes with file extensions that don t fit 3-4 characters  such as eg   manifest

[php] How to remove extension from string (only real extension!)

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