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<?php $description = '<img src="http://web1.cz/obrazek.jpg">'; $description = preg_replace_callback('#<img(.*)src="(.*)"(.*)>#i', function($matches) { return '<img'.$matches[1].'src="img/'.base64_encode($matches[2]).'"'.$matches[3].'>'; }, $description); echo $description;
Output for git.master, git.master_jit, rfc.property-hooks
<img src="img/aHR0cDovL3dlYjEuY3ovb2JyYXplay5qcGc=">

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