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Memory problem in PHP simple HTML DOM

I was using PHP Simple HTML dom, a great and free library for parsing html pages and retreiving info from it. I really liked it.. But when it comes to parsing many differents pages of some website in one php script, you will get an error:

Allowed memory size of 67108864 bytes exhausted,

and this is because simple HTML dom don't free up the memory in real time, so the solution is:

Each time you create a dom object ( foe exemple using: $html = file_get_html("http://someurl/"); or str_get_html... ), then when you don't need it anymore you have to call _destruct:
$html->_destruct();
unset($html);

“Who Is Online” Widget With PHP, MySQL & jQuery

5-Best scripts

Do you see in some website a nice list of online users ? Do you want to have one in your website ? That should be easy now thanks to this very helpful and easy-to-install widget:

“Who Is Online” Widget With PHP, MySQL & jQuery

I hope you will like it :)

PHP Validate Email Address: Email Validator

5-Best scripts, email, Forms

When working with forms and interacting with your visitors, you may want to verify if your visitor entered an email address in the right field, and if it is valide or not.

Most of people who are new to php world, just verify if the text box of the email address is filled or not, without verifying the syntax of the email address...

Something like this they use:

if (isset($_POST['email'])) {
// do something
}

But when you want to develop a php website in the best way, taking care of all little details, you should think what happens when your user does make a mistake in the email address, writing something like this: his_email@gmailcom, or his_emailgmail.com or even he writes ssdfsff (like many people do), I'm sure you would like to inform him and ask him to correct his email address, you maybe also want to check if the domain name of his email address is valid, you can't accept an email like this: blahblah@dfsjhbhjjqsdqq.fdf .

So here is the php script I think you should use everytime you have a form with 'email address' input :

<?php
function validate_email($email) {

//check for all the non-printable codes in the standard ASCII set,
//including null bytes and newlines, and exit immediately if any are found.
if (preg_match("/[\\000-\\037]/",$email)) {
return false;
}
$pattern = "/^[-_a-z0-9\'+*$^&%=~!?{}]++(?:\.[-_a-z0-9\'+*$^&%=~!?{}]+)*+@(?:(?![-.])[-a-z0-9.]+(?<![-.])\.[a-z]{2,6}|\d{1,3}(?:\.\d{1,3}){3})(?::\d++)?$/iD";
if(!preg_match($pattern, $email)){
return false;
}
// Validate the domain exists with a DNS check
// if the checks cannot be made (soft fail over to true)
list($user,$domain) = explode('@',$email);
if( function_exists('checkdnsrr') ) {
if( !checkdnsrr($domain,"MX") ) { // Linux: PHP 4.3.0 and higher & Windows: PHP 5.3.0 and higher
return false;
}
}
else if( function_exists("getmxrr") ) {
if ( !getmxrr($domain, $mxhosts) ) {
return false;
}
}
return true;
} // end function validate_email
?>

Now you can use this function with the email address you want to verify as parameter, and it will return you true if it valide and false if it is not.
This nice function will not know if an email exist really or not, it just verifies the syntax and the domain name, for example will not know that qsddsfqsdsdfqsdsqdsqd@gmail.com is not valide, but knows that qsqsdsq@dfsfsqdqsdqd.com is an invalid email address .

I hope this help you a lot.
Please leave comments or link to us if you think this is usefull :)

PHP send mail SMTP authentification

5-Best scripts, email

this is a very complete php send mail script, with authentification ofcourse.
You can choose the smtp server, use your username and password, and can send a html email.

This script does not use php mail() function, it's all from scrach.

function authSendEmail($from, $namefrom, $to, $nameto, $subject, $message)
{

$smtpServer = "smtpout.europe.secureserver.net";
$port = "25";
$timeout = "30";
$username = "username@mailserver.com";
$password = "mypassword";
$localhost = "localhost"; //hosting server
$newLine = "\r\n";

$smtpConnect = fsockopen($smtpServer, $port, $errno, $errstr, $timeout);
$smtpResponse = fgets($smtpConnect, 515);
if(empty($smtpConnect))
{
$output = "Failed to connect: $smtpResponse";
return false;
} else {
$logArray['connection'] = "Connected: $smtpResponse";
}

//Request Auth Login

fputs($smtpConnect,"AUTH LOGIN" . $newLine);

$smtpResponse = fgets($smtpConnect, 515);

//Send username

fputs($smtpConnect, base64_encode($username) . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

//Send password
fputs($smtpConnect, base64_encode($password) . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

//Say Hello to SMTP
fputs($smtpConnect, "HELO $localhost" . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

//Email From
fputs($smtpConnect, "MAIL FROM: $from" . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

//Email To
fputs($smtpConnect, "RCPT TO: $to" . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

//The Email
fputs($smtpConnect, "DATA" . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

//Construct Headers
$headers = "MIME-Version: 1.0" . $newLine;
$headers .= "Content-type: text/html; charset=iso-8859-1" . $newLine;
//Add these two lines if you have any problem
//$headers .= "To: $nameto <$to>" . $newLine;
//$headers .= "From: $namefrom <$from>" . $newLine;

fputs($smtpConnect, "To: $nameto <$to>\nFrom: $namefrom <$from>\nSubject: $subject\n$headers\n\n$message\n.\n");
$smtpResponse = fgets($smtpConnect, 515);

// Say Bye to SMTP
fputs($smtpConnect, "QUIT" . $newLine);
$smtpResponse = fgets($smtpConnect, 515);

return true;
}

That's it, just copy this mail SMTP authentification function and change configuration variables values to your own (smtpserver, port, username, password, ...).

303

ob_start - save php output to a string - The PHP output buffering

3-Strings, 5-Best scripts

I want to share this great php utility: the output buffering, it is sometimes very usefull. So what it does ?
The PHP output buffering will save all the server outputs ( html and php prints) to a string variable.

So to start buffering, use ob_start(); this will keep saved any output.
Then you use $variable = ob_get_clean(); to stop buffering, and copy the buffer content to the variable.

Here are few samples of the use of ob_start() and ob_get_clean()

<?php ob_start(); //Turn on output buffering ?>
Hello world, <a href="http://www.blogger.com/myotherpage.php">link</a>
<div class="style">Content</div>
<?php $var = ob_get_clean(); //copy current buffer contents into $message variable and delete current output buffer ?>

Now the content of the variable $var should be:

Hello word, <a href="http://www.blogger.com/myotherpage.php">link</a>
<div class="style">Content</div>

Another example (with php outputs buffered)

<?php ob_start(); ?>
Hello world, <?php echo "My Website"; ?>
Thank you.
<?php $var = ob_get_clean(); ?>

And this will be the content of $var:

Hello world, My Website
Thank you.

That's all !

PHP Post data to url with curl

5-Best scripts

I know you will need sometimes to use a php code to send data (text) to an url using POST method, just like it was sent by a form.
So all you have to do now, is to copy this function and use it, you have to specify the url and the data to post and it goes !

<?php
function post_content($url,$nfields,$fields_string)  
{
    $ch = curl_init();  
    curl_setopt($ch, CURLOPT_URL, $url);  
    curl_setopt($ch,CURLOPT_POST,$nfields);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; MSIE 7.0; Windows NT 6.0; en-US)');  
    ob_start();  
    curl_exec ($ch);  
    curl_close ($ch);  
    $string = ob_get_contents();  
    ob_end_clean();  
    return $string;      
}
?>

How this will work ? It's very easy:
1- First you need to know what url you want to post to using curl
2- You need to know what are the names of variables to post (textarea, checkbox..)
3- Their number
4-And their values

This is a quite easy exemple:
if the original form has these fields: textarea1, textarea2, and sends to "www.site.com/page.php", like this example:

<form name="form1" method="post" action="www.site.com/page.php">
  <textarea name="textarea1"></textarea>
  <textarea name="textarea2"></textarea>
</form>

You should use this function in this way:
post_content("http://www.site.com/page.html",2,"textarea1=value1&textarea2=value2")

$nfields=2 because you have two fields (textarea1 and textarea2) ,
$fields_sring = "textarea1=value1&textarea2=value2" because you want to post two variables ( fields values) value1 for the field textarea1 and value2 for the field textarea2, you have to write always "&" between each couple of fieldname-value.

What does this all mean, and for what ?
With this function you will be able to "assimilate" the use of the form and the submit button, and this mean you will be able to get the content of the page www.site.com/pahe.php without using the form, because php can't use a form :)

That's all !

PHP eval - Execute php script in a string

3-Strings, 5-Best scripts

Do you want to be able to run a php script in a string ?
This could be very helpful, for example if you want to use a module or a template, you may have a php script in a string, just like that:

Hello echo $username; ?> . You are wellcome !

What if you have this in a text file ? or in a database ? What should you do ?
If you loads that text in a string, and echo it to the html page, it will not be executed by php.

<?php
$string = "Hello ?> . You are wellcome !";
echo $string;
?>

Display:

Hello ?> . You are wellcome !

So how to make php execute it ?

If you have only a php script in a string, you just use eval() to execute:

<?php
$string = "echo $username; ";
eval ( $string ) ;
?>

This is the same thing than:

<?php
echo $username;
?>

If you have a string that is a html with some php tags, like the first example, do the following:

<?php

$username = "SMITH" ;
$string = "Hello . You are wellcome !";

// This will search for the php script in the string:
$pos = strpos( $tmp ,"" ) ;
$pos2 = strpos ( $tmp , "?>" , $pos ) ;
$scr = substr($tmp,$pos + 5 , $pos2 - $pos -3 ) ;

//This will execute the script.
echo substr($tmp,0,$pos);
eval( " $scr " );
echo substr($tmp,$pos2+2);

?>