search in words on an string and change formatting - php

Question

I wan't to create a highlight tag search function via php
when I search a part of word...whole of word be colored
for example this is a sample text:
Text: British regulators say traders used private online chatrooms to coordinate their buying and selling to shift currency prices in their favor.
when I search "th" the output be like this:
Text: British regulators say traders used private online chatrooms to coordinate their buying and selling to shift currency prices in their favor.
So...I tried this code...please help me to complete it.
This is a algorithm:
$text= "British regulators say...";
foreach($word in $text)
{
if( IS There "th" in $word)
{
$word2= '<b>'.$word.'</b>'
replace($word with word2 and save in $text)
}
}
how can I it in php language?

Answer 1

function highLightWords($string,$find)
{
return preg_replace('/\b('.$find.'\w+)\b/', "<b>$1</b>", $string);
}
Usage:
$string="British regulators say traders used private online chatrooms to coordinate their buying and selling to shift currency prices in their favor.";
$find="th";
print_r(highLightWords($string,$find));
Fiddle
Edit after your comment:
...How can I do it for middle characters? for example "line"
Very easy, just update the regex pattern accordingly
return preg_replace("/\b(\w*$find\w*)\b/", "<b>$1</b>", $string);
Fiddle

Answer 2

Use strpos() to find the position of the character you search for.. Then start reading from that identified position of character to till you don't find any space..

Answer 3

Should be much easier:
$word = "th";
$text = preg_replace("/\b($word.*?)\b/", "<b>$1</b>", $text);

Answer 4

Let's say a lot of things.
First, as you know php is a server-side code, so, as long as you won't mind reload the page each time or use ajax...
The correct way i think will be using Javascript to Achieve this.
That said to explode the text you need to use another function, to be sure of what obtained:
Something like:
$str = "Hello world. It's a beautiful day.";
$words = explode(" ",$str);
Now Words var will contain the exploded string.
Now you can loop and replace (for example) and then re-construct the string and print it or do other.

Answer 5

You can go with the following code
<?php
$string = "British regulators say traders used private online chatrooms to coordinate their buying and selling to shift currency prices in their favor";
$keyword = "th";
echo highlightkeyword($string , $keyword );
function highlightkeyword($str, $search) {
$occurrences = substr_count(strtolower($str), strtolower($search));
$newstring = $str;
$match = array();
for ($i=1;$i<$occurrences;$i++) {
$match[$i] = stripos($str, $search, $i);
$match[$i] = substr($str, $match[$i], strlen($search));
$newstring = str_replace($match[$i], '[#]'.$match[$i].'[#]', strip_tags($newstring));
}
$newstring = str_replace('[#]', '<b>', $newstring);
$newstring = str_replace('[#]', '</b>', $newstring);
return $newstring;
}
?>
Check here https://eval.in/220395