CODEWITHSUNDEEP
phpmysqlstringfunction
Jay Wit
Jay Wit

Reputation: 3057

Replace exact variable string with variable text in PHP?

I'm working on a replying system similar to twitters.
In a string there is a piece of text where the id is variable ex.: 14& , 138& depending to who you're replying.
How can I find the 14& in a string and replace it with <u>14&</u>?

This is how it looks: 

14& this is a reply to the comment with id 14

This is how it should look like:

<u>14&</u> this is a reply to the comment with id 14

How can I do this in PHP? Thanks in advance!

Upvotes: 1

Views: 273

Answers (3)

Adam Kiss
Adam Kiss

Reputation: 11859

If you know the ID, it's simple:

<?php
  $tweet_id = '14';
  $replaced = str_replace("{$tweet_id}&", "<u>{$tweet_id.}&</u>", $original);

If you don't, preg_replace

<?php
  //look for 1+ decimals (0-9) ending with '$' and replaced it with
  //original wrapped in <u>
  $replaced = preg_replace('/(\d+&)/', '<u>$1</u>', $original);

Upvotes: 2

Basti
Basti

Reputation: 4042

$text = "14& this is a reply to the comment with id 14";

var_dump(preg_replace("~\d+&~", '<u>$0</u>', $text));

outputs:

string '<u>14&</u> this is a reply to the comment with id 14' (length=52)

To get rid of the &:

preg_replace("~(\d+)&~", '<u>$1</u>', $text)

outputs:

string '<u>14</u> this is a reply to the comment with id 14' (length=51)

$0 or $1 will be the your id. You can replace the markup with anything you like.

for instance a link:

$text = "14& is a reply to the comment with id 14";

var_dump(preg_replace("~(\d+)&~", '<a href="#comment$1">this</a>', $text));

outputs:

string '<a href="#comment14">this</a> is a reply to the comment with id 14' (length=66)

Upvotes: 2

Jacob Oettinger
Jacob Oettinger

Reputation: 766

Use regular expressions with the preg_replace function.

<?php

$str = '14& this is a reply to the comment with id 14';
echo preg_replace('(\d+&)', '<u>$0</u>', $str);

The regex matches: one or more digits followed by an ampersand.

Upvotes: 2

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