Insert string into string?

Question

I have a number of images being uploaded to a site with random file names e.g.

http://www.mysite.com/uploads/images/apicture23.jpg
http://www.mysite.com/uploads/images/anotherpicture203.jpeg
http://www.mysite.com/uploads/images/another.picture203.png
http://www.mysite.com/uploads/images/athird-picture101.gif

Is it possible in PHP to somehow insert immediately before the file extension (.jpg, .jpeg .png or .gif) part of the url another string such as -300x200 ?

mvds · Accepted Answer · 2012-11-02 01:37:41Z

5

$out = preg_replace('/\.[a-z]+$/i','-300x200\0',$in);

This basically does this, reading from left to right:

It replaces anything starting with a dot (\.), followed by one or more (+) characters in the range a-z, at the end ($) of the string, case-insensitive (i), by -300x200 followed by the part of the string just matched (\0).

edited Nov 2, 2012 at 1:37

answered Nov 2, 2012 at 1:31

mvds

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2 Comments

Michael Berkowski Over a year ago

Please explain to the OP what this does and how it works, and link to documentation where appropriate.

mvds Over a year ago

I am positive that the top 1 hit in google on preg_replace will lead to the official php.net documentation.

Tepken Vannkorn · Accepted Answer · 2012-11-02 01:40:25Z

If you wish to rename your file name when you upload the image, the bellowing class will help you:

<?php

    function thumbnail( $img, $source, $dest, $maxw, $maxh ) {      
        $jpg = $source.$img;

        if( $jpg ) {
            list( $width, $height  ) = getimagesize( $jpg ); //$type will return the type of the image
            $source = imagecreatefromjpeg( $jpg );

            if( $maxw >= $width && $maxh >= $height ) {
                $ratio = 1;
            }elseif( $width > $height ) {
                $ratio = $maxw / $width;
            }else {
                $ratio = $maxh / $height;
            }

            $thumb_width = round( $width * $ratio ); //get the smaller value from cal # floor()
            $thumb_height = round( $height * $ratio );

            $thumb = imagecreatetruecolor( $thumb_width, $thumb_height );
            imagecopyresampled( $thumb, $source, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height );

            $path = $dest.$img."-300x200.jpg";
            imagejpeg( $thumb, $path, 75 );
        }
        imagedestroy( $thumb );
        imagedestroy( $source );
    }

?>

Where

      $img         => image file name
      $source      => the path to the source image
      $dest        => the path to the destination image
      $maxw        => the maximum of the image width you desire
      $maxh        => the minimum one

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