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MongoCollection::toIndexString — Converts keys specifying an index to its identifying string
keys
Field or fields to convert to the identifying string
Returns a string that describes the index.
Example #1 MongoCollection::toIndexString() example
This example shows how you can create an index name out of of keys. Because this is a protected (static) method, you need to overload it in a child class first.
<?php
// Create inheritec class to make the method "public".
class MyCollection extends MongoCollection
{
static public function toIndexString($a)
{
return parent::toIndexString($a);
}
}
echo MyCollection::toIndexString("foo")), "\n";
// Outputs: foo_1
echo MyCollection::toIndexString(array('name' => 1, 'age' => -1)), "\n";
// Outputs: name_1_age_-1
?>
MongoDB core docs on » indexes.