How to parse an entire web page in php / single line?

Use file_get_contents instead of file.

Here is an example.

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$url = 'http://google.com';
$lines = file_get_contents($url);

If you want to parse a single certain line from a web page, here is a code example.

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$url = 'http://google.com';
$content = file($url);
$certain_ine = $content[153];

It will echo the content from line 153 from google.com.