What PHP command would peek into a page and record its HTML code (source)? [closed]

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Would you, please, tell me what command (or a combination of those) in PHP would check a web-page by its URL and possibly download its code (HTML) into a variable? Well, I was suggested to use Goggle App Engines for this here, but I am also quite q curious about how much of that task can PHP perform.

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$f = file_get_contents('http://www.google.com');

http://php.net/file_get_contents

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Hello First Visit this webpage file-get-contents.

If you think the above is to complex use a library PHP Simple HTML DOM Parser download here PHP Simple HTML DOM Parser

And Finaly here is the code

<?php
include_once 'simple_html_parser.php';

$html = file_get_html('http://www.google.com/');

// Find all images
foreach($html->find('img') as $element)
       echo $element->src . '<br>';

// Find all links
foreach($html->find('a') as $element)
       echo $element->href . '<br>'; 
?>

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You could use curl. Here is a tutorial