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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<!DOCTYPE HTML>
<html>
<head>
<title>PHP Highlighting</title>
</head>
<body>
<?php
highlight_file(__FILE__);
?>
</body>
</html>
<?php
echo preg_replace_callback('~([a-z])~', function ($match) {
return strtoupper($match[1]);
}, 'hello--world');
// выведет helloWorld
?>