replacing a character at a certain pos in the str using php

Question

exp. string to replace;

 150941_3D-glass-green-effect-hd-wallpapers_jpg

I need to replace the character _jpg with .jpg but the extension can change so I need _ to be replaced with a point. I have tried strpos and then substr_replace but this removes everything after and include the _.

You should take a look at [PHP Replace Last Occurence of a String in a String?](http://stackoverflow.com/questions/3835636/php-replace-last-occurence-of-a-string-in-a-string). This will show you how to change only the last instance of the underscore without affecting anything else. — SnoringFrog, Sep 09 '14 at 13:27

score 2 · Answer 1 · answered Sep 09 '14 at 13:29

Tested with 2 extensions and also accounts for jpeg

$str1 = '150941_3D-glass-green-effect-hd-wallpapers_jpg';
$str2 = '150941_3D-glass-green-effect-hd-wallpapers_png';

$str1 = preg_replace('/_([a-z]{3,4})$/', '.$1', $str1);
$str2 = preg_replace('/_([a-z]{3,4})$/', '.$1', $str2);

echo $str1; //150941_3D-glass-green-effect-hd-wallpapers.jpg
echo $str2; //150941_3D-glass-green-effect-hd-wallpapers.png

score 1 · Answer 2 · answered Sep 09 '14 at 13:27

1

Use the str_replace command.

$string = '150941_3D-glass-green-effect-hd-wallpapers_jpg';
$new = '.jpg' // or wathever you want.
$new_string = str_replace('_jpg', $new, $string);

answered Sep 09 '14 at 13:27

Wezy

665
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5
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This will also replace _jpg if it's anywhere else in string. And also questioner wanted a solution for other file formats too – Onimusha Sep 09 '14 at 13:33

score 1 · Answer 3 · answered Sep 09 '14 at 13:28

1

You could do this:

$filename = "150941_3D-glass-green-effect-hd-wallpapers_jpg";
$position = strrpos($filename, "_");
if($position !== false) {
    $filename = substr_replace($filename, ".", $position, 1);
}

answered Sep 09 '14 at 13:28

Jeroen de Jong

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1
6

jancha · Answer 4 · 2014-09-09T22:03:53.757

0

<?php
$o = "150941_3D-glass-green-effect-hd-wallpapers_jpg";
$o = preg_replace("/_([^_]+)$/", ".\\1", $o);
echo $o;

edited Sep 09 '14 at 22:03

answered Sep 09 '14 at 13:26

jancha

4,916
1
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does not work. it replace's the _ in the beginnen too. – phpFreak Sep 09 '14 at 13:29
this solution will replace every "_" in the string. – may saghira Sep 09 '14 at 13:29
fixed bug in the code – jancha Sep 09 '14 at 22:04

score 0 · Accepted Answer · answered Sep 09 '14 at 13:30

0

Check below code

$imgExt = array('_jpg','_jpeg','_png','_bmp','_gif');
$replaceExt = array('.jpg','.jpeg','.png','.bmp','.gif');
$string = '150941_3D-glass-green-effect-hd-wallpapers_jpg';
$replacedText = str_replace($imgExt,$replaceExt,$string);

answered Sep 09 '14 at 13:30

Mahadeva Prasad

709
8
19

replacing a character at a certain pos in the str using php

5 Answers5