php: save PHP variables to a text file

Writing $text to a file:

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$text = "Anything";

$var_str = var_export($text, true);

$var = "<?php\n\n\$text = $var_str;\n\n?>";

file_put_contents('filename.php', __FILE__ . ":". __LINE__ . "\t" . date(DATE_RFC2822) . "\n", FILE_APPEND | LOCK_EX);

file_put_contents('filename.php', $var, FILE_APPEND | LOCK_EX);

Retrieving it again:

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include 'filename.php';

echo $text;