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    <p>Ok, one way to do this is to check the message before it's even been added to the chat file. A easy way to accomplish this with PHP is to use PHP Sessions that will store a counter for repeated values. Since I don't know the structure of your site, I'll give you basic instructions of how to do this: <br/></p> <p><strong>1. Start the session for the "post to chat" function</strong><br/> PHP Sessions need to be started wherever you use them. This can be done with a simple. <br/></p> <pre><code>session_start(); </code></pre> <p><strong>2. Create the two session variables if it doesn't exist</strong></p> <pre><code>session_start(); if(!isset($_SESSION['latest_link'])){ //isset() checks whether or not the variable exists $_SESSION['latest_link'] = ""; } if(!isset($_SESSION['duplicate_count'])){ $_SESSION['duplicate_count'] = 0; } </code></pre> <p><strong>3. For new links check if it matches the last link</strong></p> <pre><code>session_start(); if(!isset($_SESSION['latest_link'])){ //isset() checks whether or not the variable exists $_SESSION['latest_link'] = ""; } if(!isset($_SESSION['duplicate_count'])){ $_SESSION['duplicate_count'] = 0; } if($_SESSION['latest_link'] == trim(strtolower($link))){ //where $link is the new link being posted. trim() removes unneeded whitespace and strtolower() makes everything lowercase. This way, the poster can't fool the system through capitalization or extra spaces } </code></pre> <p><strong>5. If the link is a duplicate add one to the <code>duplicate_count</code>.</strong></p> <pre><code>session_start(); if(!isset($_SESSION['latest_link'])){ //isset() checks whether or not the variable exists $_SESSION['latest_link'] = ""; } if(!isset($_SESSION['duplicate_count'])){ $_SESSION['duplicate_count'] = 0; } if($_SESSION['latest_link'] == trim(strtolower($link))){ //where $link is the new link being posted. trim() removes unneeded whitespace and strtolower() makes everything lowercase. This way, the poster can't fool the system through capitalization or extra spaces $_SESSION['duplicate_count']++; //add one to duplicate_count } </code></pre> <p><strong>6. Check if the <code>duplicate_count</code> is larger than 2</strong></p> <pre><code>session_start(); if(!isset($_SESSION['latest_link'])){ //isset() checks whether or not the variable exists $_SESSION['latest_link'] = ""; } if(!isset($_SESSION['duplicate_count'])){ $_SESSION['duplicate_count'] = 0; } if($_SESSION['latest_link'] == trim(strtolower($link))){ //where $link is the new link being posted. trim() removes unneeded whitespace and strtolower() makes everything lowercase. This way, the poster can't fool the system through capitalization or extra spaces $_SESSION['duplicate_count']++; //add one to duplicate_count } if($_SESSION['duplicate_count'] &gt; 2){ //user has posted same link more than 2 times. Action should be taken. } </code></pre> <p><strong>7. Log the user's latest link if it is different, and reset the counter</strong> <br/> Simply done with</p> <pre><code>session_start(); if(!isset($_SESSION['latest_link'])){ //isset() checks whether or not the variable exists $_SESSION['latest_link'] = ""; } if(!isset($_SESSION['duplicate_count'])){ $_SESSION['duplicate_count'] = 0; } if($_SESSION['latest_link'] == trim(strtolower($link))){ //where $link is the new link being posted. trim() removes unneeded whitespace and strtolower() makes everything lowercase. This way, the poster can't fool the system through capitalization or extra spaces $_SESSION['duplicate_count']++; //add one to duplicate_count }else{ $_SESSION['latest_link'] = trim(strtolower($link)); $_SESSION['duplicate_count'] = 0; } if($_SESSION['duplicate_count'] &gt; 2){ //user has posted same link more than 2 times. Action should be taken. } </code></pre> <p>Of course, you should also consider securing your sessions to prevent <code>session hijacking</code>, but that is another topic that you can find plenty of answers for on Stack Overflow. This post has some good pointers: <a href="https://stackoverflow.com/questions/328/php-session-security">PHP Session Security</a></p>
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    1. POhow to count repeated post in chat page using php or php session?
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    1. COthanks a lot, i will give it a try tomorrow since it's already 4AM this part of the world :) thanks again
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