Replace string before a string?

Question

Sorry, I'm bad English. I'm going to post my code now:

    $image = 'http://example.com/thisisimage.gif';
    $filename = substr($image, strrpos($image, '/') + 1);
    echo '<br>';
    echo $filename;
    echo '<br>';            
    echo preg_replace('/^[^\/]+/', 'http://mydomain.com', $image);   
    echo '<br>';

$image is string;

$filename is image name (in example above, it returns 'thisisimage.gif')

Now i want replace all before $filename with 'http://mydomain.com', my code is above but it doesnt work.

Thanks!

do you want to turn //example.com/thisisimage.gif to //localhost/thisisimage.gif ? Really I did not understand what you are asking. — Volkan
– Volkan, Commented Mar 15, 2013 at 9:35
Then you have allready done the hard part. Look at my answer below. — Volkan
– Volkan, Commented Mar 15, 2013 at 9:43

S.Visser · Accepted Answer · 2013-03-15 09:46:06Z

2

$foo = explode($filename, $image);
echo $foo[0];

Explode "splits" one the given paramater ( in your case $filename ). It returns an array with where the keys are split on the string you gave.

And if you just want to change the url. you use a str_replace

   $foo = str_replace("http://example.com", "http://localhost", $image);

   //This will change "http://example.com" to "http://localhost", like a text replace in notepad.

In your case:

    $image = 'http://example.com/thisisimage.gif';
    $filename = substr($image, strrpos($image, '/') + 1);
    $foo = explode($filename, $image);
    echo '<br>';
    echo $filename;
    echo '<br>';            
    echo str_replace($foo[0], "http://yourdomain.com/", $url);
    echo '<br>';

edited Mar 15, 2013 at 9:46

answered Mar 15, 2013 at 9:33

S.Visser

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1 Comment

Thanh Nguyen Over a year ago

i think this is the best solution. Thanks!

aleation · Accepted Answer · 2013-03-15 09:49:56Z

2

There's another approach in which you don't need a regular expression:

in Short:

$image = 'http://example.com/thisisimage.gif';
$url = "http://mydomain.com/".basename($image);

Explanation:

If you just want the file name without url's or directory path's, basename() is your friend;

$image = 'http://example.com/thisisimage.gif';
$filename = basename($image);

output: thisisimage.gif

Then you can add whatever domain you want:

$mydomain = "http://mydomain.com/";
$url = $mydomain.$filename;

edited Mar 15, 2013 at 9:49

answered Mar 15, 2013 at 9:37

aleation

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1 Comment

S.Visser Over a year ago

dont forget the "/" basename() just grabs the filename.

Prasanth Bendra · Accepted Answer · 2013-03-15 09:35:43Z

1

Try this :

$image = 'http://example.com/thisisimage.gif';  
echo preg_replace('/^http:\/\/.*\.com/', 'http://mydomain.com',$image);

answered Mar 15, 2013 at 9:35

Prasanth Bendra

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Comments

Volkan · Accepted Answer · 2013-03-15 09:42:02Z

1

This should simply work:

$image = 'http://example.com/thisisimage.gif';
$filename = substr($image, strrpos($image, '/') + 1);
echo '<br>';
echo $filename;
echo '<br>';            
echo 'http://mydomain.com/'.$filename;   
echo '<br>';

answered Mar 15, 2013 at 9:42

Volkan

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Comments

Eric MJ · Accepted Answer · 2013-03-15 09:43:36Z

1

if you just like to add your own domain before the file name, try this:

$filename = array_pop(explode("/", $image));
echo "http://mydomain.com/" . $filename;

if you wanna only replace thedomain, try this:

echo preg_replace('/.*?[^\/]\/(?!\/)/', 'http://mydomain.com/', $image);

answered Mar 15, 2013 at 9:43

Eric MJ

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Comments

Rolice · Accepted Answer · 2013-03-15 10:20:06Z

1

The other people here have given good answers about how to do it - regex has its advantages but also drawbacks - its slower, respectively requires more resources and for something simple as this, I would advice you to use the explode approach, but while speaking for regex functions you also may try this, instead your preg_replace:

echo preg_replace('#(?:.*?)/([^/]+)$#i', 'http://localhost/$1', $image);

It seems variable length positve lookbehind is not supported in PHP.

edited Mar 15, 2013 at 10:20

answered Mar 15, 2013 at 9:41

Rolice

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