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string get_resource_type ( resource $handle )

<?php
$c = mysql_connect();
echo get_resource_type($c) . PHP_EOL;
// Prints: mysql link

$fp = fopen("foo","w");
echo get_resource_type($fp) . PHP_EOL;
// Prints: file

$doc = new_xmldoc("1.0");
echo get_resource_type($doc->doc) . PHP_EOL;
// Prints: domxml document
?>