What is a PHP code to automatically bold certain words within my content?

[surfwtw]

I want a code to automatically make specific words within my content bold. For example, If the word "car" appears, make that word bold. Thanks

[Pikachu2000]

Where are you stuck? Post your code and tell us what problems you're having with it.

[AyKay47]

most likely str_replace, or for more complex patterns, preg_replace

[QuickOldCar]

There's always an issue with case when replacing, they can replace any match it finds, but sadly would then replace with whatever case your search word was.

Here is my solution.

 

<?php
function boldWord($word,$text){
$word = strtolower($word);
$ucf_word = ucfirst($word);
$uc_word = strtoupper($word);
return str_replace(array($word,$ucf_word,$uc_word), array("<b>$word</b>","<b>$ucf_word</b>","<b>$uc_word</b>"), $text); 
}

$text = "Let's replace car in the text, Car and CAR also replaces.";
echo boldWord("car",$text);
?>

 

Results:

Let's replace car in the text, Car and CAR also replaces.

 

If you don't care about the case, a simple str_ireplace would do.

$text = "Let's replace car in the text, Car and CAR also replaces.";
$word = "car";
echo str_ireplace($word, "<b>$word</b>", $text);

or preg_match

$text = "Let's replace car in the text, Car and CAR also replaces.";
$word = "car";
$pattern = "/$word/i";
$replace = "<b>$word</b>";
echo preg_replace($pattern, $replace, $text);

Results for both:

Let's replace car in the text, car and car also replaces.

[PFMaBiSmAd]

Or if you only want to replace whole matching words -

 

<style type="text/css">
span.highlight {font-weight:bold;} 
</style>
<?php

$search =  "php|web"; // can be a single word or an OR'ed list of words

$string = "PHP is the web scripting language of choice, php, Web, phpweb";

$string = preg_replace("/\b($search)\b/i",'<span class="highlight">\1</span>',$string);

echo $string;

[QuickOldCar]

Yup, that's a good way too PFMaBiSmAd

 

A while back I made 2 different functions for a multi-word,multi-color highlighter

 

demo and code

 

In use at my random urls

example

[surfwtw]

Here is the code.  "$word" is the word that I want to be bold. "$definition" is all the content that is being displayed.  When "$word" appears in the content ($definition) I want "$word" to be bold.  Thanks

 

<h2><b>Definition of <?php echo "$word";?></b></h2>

</td>

</tr>

 

<tr>

<td cellpadding="5">

<?php echo "$definition"; ?> </center></br></br>

[QuickOldCar]

The answers were already written in the previous posts, but here is the code using PFMaBiSmAd's method

 

<style type="text/css">
span.highlight {font-weight:bold;} 
</style>

<h2><b>Definition of <?php echo "$word";?></b></h2>
</td>
</tr>

<tr>
<td cellpadding="5">
   <?php echo preg_replace("/\b($word)\b/i",'<span class="highlight">\1</span>',$definition); ?> </center></br></br>

[QuickOldCar]

wrong post

[Unclickable]

 

   <?php echo preg_replace("/\b($word)\b/i",'<span class="highlight">\1</span>',$definition); ?> </center></br></br>

 

Hey I am kind of new to this and have the same problem. But could someone explain to me what the "/\b($word)\b/i" part of the code means? Sorry for the newbiness. 

[QuickOldCar]

\b is a word boundary

 

to see the other escape sequences

http://de2.php.net/manual/en/regexp.reference.escape.php

[QuickOldCar]

I bet you thought it might have meant bold, as in html's <b></b>, but it isn't.

 

An easy way to highlight without using the css style

echo preg_replace("/\b($word)\b/i", "<b>\1</b>", $string_of_text);

 

 

[jcbones]

Hey I am kind of new to this and have the same problem. But could someone explain to me what the "/\b($word)\b/i" part of the code means? Sorry for the newbiness. 

 

It is a regular expression pattern.  RegEx is complicated, but will match any string you need.

RegEx tutorial.